BTW, I'll just add that most of the coins that I have purchased (I posted pictures of them in another thread), I have purchased from eBay, and I always ask lots of questions, and am very picky about my coins. I have never been blocked, but I always make sure to explain my question and be very nice about it in an almost apologizing type of way. I want to make sure I convey to the seller that I am a very reasonable buyer who just has some questions, and not someone who could cause them problems.
Most sellers do not mind if buyers have an problem with something, but they want the type of buyer who will give them the opportunity to make it right, and not someone who will just leave bad feedback or DSRs without notifying them first and giving them the chance to fix the problem. Nobody is perfect and it is difficult to please everyone, but if you mess up then you should have the chance to make it right without losing your livelihood.