But that's the "risk" they take by upping anything to Youtube though? Besides, the DVDs usually hold at least a bonus feature or something. Streaming it on youtube I would think actually would be a great way to make casual fans interested enough to actually buy the DVD later on. The thing they see on Youtube won't be in the same good quality (picture, sound, editing) as the actual DVD will be.
I could see the reason for why Aichan's was at Budoukan - they had just lost Eri, Junjun and Linlin and that could bring some insecurities in terms of popularity and all considering they still sold just about 50k or so. But after the recent rise in popularity MM has gotten, and with Reina easily being as popular as Ai (or more now, I don't know?) and her leaving being a huge deal to the group, I don't see how they couldn't figure out that she would sell out immediately. I want to think that they couldn't go with YokoAri/SSA because it was already booked or something.