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Justin, the short answer is, yes, a telescope can be serviced. To give a list of faults would probably cost almost as much as fixing same and that cost would be about as flexible as the length of a piece of string.
I would not consider it reasonable to ask a vendor to have a service performed before purchase, unless s/he was a commercial dealer. Buying from a member of IIS, one is usually reasonably sure of an ethical deal, as long as that member has good standing, ie. not someone with only 2 or 3 posts and all of those trying to sell something.
The other aspect is that, as you haven't had a scope before, you don't know what to expect and it's a little unfair to question the seller on the basis of your (unformed) expectations.
I would suggest that you join or at least visit an astronomy club before you buy anything, try various scopes and ask LOTS of questions and seek as much advice as possible. Everyone has a different opinion on the best scope to buy and what you should pay for it and what you can expect it to do.
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