Not at all. I generated a key for a win7, a visual studio and an office on the day that I got the account and that's it. I've been using the virtual machines on Azure though. Kept a Linux machine up and running all the time. But that didn't even eat half the monthly credit that comes with this type of MSDN.
Other things to note is that I received a couple of standard emails from Microsoft Reps welcoming me to Bizspark and asking me about feedback and if there's anything they can do to help me out with whatever troubles I may be having. But I completely ignored those emails.
Dear friends.. i think its not because of the seller.. 1 admin account can invite 4 more account. if any of it have issue with their account, all of them will be affected. Thats why i dont buy invite account. too risky for me.. I prefer to have control on all account myself..

I believed in your case, one of the account related to yours have issue and microsoft closed the account including yours..
Agreed that is why I only sell invites to full member ranked and above. Also its impossible for the seller to offer a warranty since too many factors go into why the MSDN sub was banned. Does your azure credit still work? If so that means the MSDN sub was banned usually due to too many keys being generated too quickly. You have to keep in mind they monitor the keys all the invites generate together as a whole. That is why when I sell invites I have a strict set of rules now to reduce the likelihood of this from happening.