you may be right. But most of those players actually have other ways to realize large return on their investment here, many of the biggest funders of vote sellers are top 20 witnesses, and also earn a large chunk of the reward pool just as a payout based on their stake - the short term profit from delegation is MORE than these sources of income, but those sources of income are not trivial. If they have another "thing" to move on to that is more attractive, of course you are right. The thing is though the system was already set up heavily on the side of rewarding stake in the first place. I am not sure it will be so easy for the major players to find "something else" more profitable than Steem even if they are not profiting from delegating SP to vote sellers.
RE: @transparencybot - three points