So the question is, where's the line. Links for cash is not acceptable, but links for % discounts in leiu of cash is fine?
What about links for vouchers?
What about links for capital bonds?
Links for negotiable bond?
Links for cheques?
Don't get me wrong, I think OS are in the clear. Its just that I'm currently much vexed with Googles subjective treatment of links (see also my other thread on Paid Link Immunity [webmasterworld.com]