If it breaks the terms of service, of course they will. If not, then you have nothing to worry about.

some people have one adsense account on over 100 sites (xfactor sites -- look it up), and they're fine. I don't think it is a matter of volume, but rather, as cbpayne pointed out, a matter of playing by G00gle's rules. Break the rules, and your adsense is gone. Even if you only have it on one site.

There is no problem, it is against Adsense rules to have more than one account so you have to use the same account for all your sites.

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There is no problem, you can use single adsense account for you all websites. There is no limit for number of websites.

AdSense has a URL channel limit of 200.

So I guess you shouldn't be worrying about it until you reach 200 sites. (without violating their TOS)

It doesn't violate the ToS for having over 200 sites. You simply won't be able to use AdSense channels to track more than 200 sites.

I use the same Adsense account on 87 (last count) sites. I never had an issue with my account.

Well it happened with me too... i too got my account cancelled.. I was using it on 15+ sites and i never used unfair means of clicks..