Bless You Boys gets notes the importance of incentives in stopping tanking.

Removing what incentive remains by having a draft lottery could help, but tanking for draft picks is not the main reason that teams don’t spend money on players. Getting those picks often doesn’t affect a team’s success or failure that much even when they land really good young players. Teams too often use those young talents as temporary promotional items, never committing to putting a good team around them and building a winner. By itself, a draft lottery won’t stop tanking. Teams must be required to spend revenue sharing dollars on payroll, and winning must be incentivized while draft incentives for losing are removed.

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It comes to mind that one incentive might be to limit the visits of popular teams. Figure out who are the big road draws, and reduce the number of games those teams play at the parks of losing teams. Due to interleague play, this is somewhat easy outside a division. When a team ties to win, they get the bigger draws.