You must not have seen all the whale humping going on in steemit, which some call raping the rewards pool. If you were a major retailer, do you want your profits linked in any way to all the crap that goes on in steemit.com? No way.

STEEM was never intended as a store of value, which is in part needed for a reliable payment tool. People complain about POW using too much electricity. But STEEM uses Proof Of Brain, which lets the sleazy whales rape the rewards pool. Not much security in that system.