All delegations, all votebots, all paid votes, etc., come from those stakes. All profits go to their wallets.

Without bots, there aren't many ways to profit from SP, yet. I believe that's because the ease with which bots enabled profit has precluded alternatives from being explored and developed.

Since no other profitable enterprises have been explored, stopping bots is a threat to profitable enterprise, and all those enterprises are staked by the largest stakeholders.