Quoting Cameron Kaiser <spectre at floodgap.com>:
I should point
out that when it comes to negative feedback - a red
mark against a buyer is essentially worthless.
But for those of us who do both ...
I agree with you there, because if you do both on one account (and at one point,
I do not know if it is the same currently, you couldn't have more than one
account, unless you violated ebay's TOS)
if someone hits you with negative feedback as a buyer and you sell on that
account, generally people won't bother to look and see if your 97% feedback is
because of buying or selling.