It's crazy the owners do this but the asset that they own and can sell for profit increases in value. Not sure how that's allowed, I'm sure there is a law to affirm its legal, but doesn't make me agree with it.
But as a fanbase you have to not dig your feet too deep in opposition or you end up with the San Diego Chargers situation, they had it down to only hotels and tourist type attractions would carry an increase in tax, which is a really good compromise IMO, they still said no and lost the team.