People have done so in the past and I haven't heard of anyone getting into trouble for doing so. I know that's not a definite answer.
paypal BIN buttons type? you can but and you shouldn't what if more than 1 people buy it at BIN? and the product for sale unique or once only? 9most sites are one time)
I was thinking of making a googlecheckout button, and posting a coupon code that is only usable once, so this way only one person can buy it. So for example make the buy now button $5000, but with coupon code price is only $4900 as an example.