Maybe a couple of reasons,

You got suspended or banned on your Xbox LIVE account.

Weren't active enough or members didn't feel they were getting the correct answer.

i havent answered a single question as an ambassador because im only signed into my email for a minute or two, but im always getting emails from the program about events like double xp for chats. ive been in the program for nearly a year now.

liner666 wrote Truthfully why dose it matter.. you where doing a job of answering people's questions for FREE when all you get is a silly little title in return? Way to let Microsoft take your money and volunteer for no thing in return.

I understand your point. The only reason I do it is for the rewards for leveling up.

Maybe there were just layed off the inactive ones.

It just means you either were't helping people very much