What do you think of out of state sellers collecting sales tax on Ebay?

I recently looked at a non-coin item and under the payment section, the seller listed about 15 states for which he will collect sales tax. This is an individual seller and not a company with a presence in all those states. Is it just a way for a seller to collect more money, or do you think he really submits sales tax revenues to all those states? I emailed him a question asking why he collects the sales tax and got no reply. That could be my answer right there...
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Now if he is sending in taxes to all those states, then I'm sure they appreciate it.
--Jerry