Wow, I keep forgetting there was a wiki subdomain. ^^;
Anyways, you’re right, it is defined as such. However, these bonus CDs/DVD fall in none of the statuses as defined in the wiki, let alone as a promotional release. Out of the only 2 possible statuses, official or promotion, bonus CDs/DVD, that are obtained only with the official release for the limited period of time it is available for the purpose of further promoting sales of the release, should count as promotional releases.
I was implying that it doesn’t fall under the MB definition of ‘promotional’. Maybe the definition is incomplete - does the style-lead @reosarevok have any thoughts?
My personal opinion, if you are purchasing a product and it comes with extras I don’t see how that is promotional. It would start being very hard to define - and you will have cases where there is no official release at all, where all versions have something specific to an outlet. As said by others, adding these as a 2-CD release seems to be the norm, and hasn’t caused any trouble that I’ve seen.
I adopted the notation on the CD as it was written on the disc.
I also forgot to add the pre-order bonus DVD.
In my opinion, the album and the bonus CD should be released separately since they are not in the same package. And they are given different catalog numbers.
By the way, the catalog number of the bonus disc starts with “PRTF”, and I think “PR” refers to PRomotion.
They were not sold separately, they were sold together.
That’s still the same release (this that shop pre-order edition), to me.
One release for both, with both catalog numbers on it, seems like the simplest way to do this for me to be honest.
・初回限定盤 CD+DVD
・通常盤 CD
・初回限定盤 予約特典つき CD+DVD+Bonus DVD
・通常盤 予約特典つき CD+Bonus DVD
・初回限定盤 アニメイト盤 CD+DVD+Bonus CD
・通常盤 アニメイト盤 CD+Bonus CD
・初回限定盤 アニメイト盤 予約特典つき CD+DVD+Bonus CD+Bonus DVD
・通常盤 アニメイト盤 予約特典つき CD+Bonus CD+Bonus DVD
・初回限定盤 タワーレコード特典つき CD+DVD+Bonus CD
・通常盤 タワーレコード特典つき CD+Bonus CD
・初回限定盤 タワーレコード特典つき 予約特典つき CD+DVD+Bonus CD+Bonus DVD
・通常盤 タワーレコード特典つき 予約特典つき CD+Bonus CD+Bonus DVD
・初回限定盤 TSUTAYA特典つき CD+DVD+Bonus CD
・通常盤 TSUTAYA特典つき CD+Bonus CD
・初回限定盤 TSUTAYA特典つき 予約特典つき CD+DVD+Bonus CD+Bonus DVD
・通常盤 TSUTAYA特典つき 予約特典つき CD+Bonus CD+Bonus DVD
・初回限定盤 VV特典つき CD+DVD+Bonus CD
・通常盤 VV特典つき CD+Bonus CD
・初回限定盤 VV特典つき 予約特典つき CD+DVD+Bonus CD+Bonus DVD
・通常盤 VV特典つき 予約特典つき CD+Bonus CD+Bonus DVD
Creating this amount of releases would be too redundant. And if we separate them in each release, doesn’t that mean that we should create other versions of the release that come with non-CD bonus (posters, etc.)?
It’s actually possible to purchase the Tower Records, TSUTAYA, and Village Vanguards bonus CDs (without the main release) on second hand shops because they are packaged separately. Examples are:
Of course, that’s no reasons to create a standalone release.
I can also sell my socks one by one in second hand, instead of pairs.
Nominated for Golden Quote of the Month… 
Does that mean we need to start up SockBrainz?
I don’t quite understand the list you posted, but I suspect having that many inter-linked release groups in the artist page would be even messier?
Maybe the fundamental difference in opinion is that I don’t see a long list of releases in a group as an issue for MB at all.
For what it’s worth, I would rather you added them separately rather than didn’t add them at all, as long as you don’t mind another community member later possible ‘improving’ (e.g. making it fit our style lead’s guidance more) it.
Yes
It’s a wrong analogy because two pairs of socks serve a purpose, no, what are you talking about?
I posted in the sense that doing as you said would end up creating these quantities of releases within the same release group. Posting the bonus discs in the “promotion” stats would clear things up like @arifer said.
Second hand stores may also sell CDs missing a booklet, multi-disc sets missing a disc, etc. The point is that MB releases are defined by how they are released/published by the artist or label, not how they may be found “in the wild”. Just like @jesus2099’s socks were originally sold in pairs, even if he’s since sold all his left socks on ebay.
I think we understood that and we said is totally fine. 
I consider that a problem. So isn’t the important thing there not your opinions, but clear guidelines that everyone can agree on?
Something that is “sold together” doesn’t necessarily mean it’s a single MusicBrainz release. You’d typically expect a MusicBrainz release to have been originally packaged together, not just “sold together”. If you take a product off the shelf, take it to the register, and the clerk gives you a separate gift, that’s clearly two separate MusicBrainz releases to me.
That’s how we used to deal with Japanese releases from labels infamous for doing this, like EXIT TUNES.
Is there an official way to get only the second product (the said gift)?
If not, it means that it is only available as a bundle, and I don’t see why it should not be the same release.
Where is the source for this?
I’d think of the 2nd as a separate promo release. When I worked in retail, we had these types of promotions all the time. It’s not really a bundle of the original because you might only get 50 of the 2nd discs but have a 100s of the original in a shipment.