So you speak for all players on DDO? By whose power? Did you speak with the majority? Or could it be, that the silent masses more than encourages the way SGG does business? That each expansion gives them more revenues and that everything else they work on may be in their good faith to actually improve the longivity and longterm balance of the game (be it misled or not)?
Seriously, go ahead. Tell all people on the forums, on the twitter, in the discord, all the servers, and elsewhere to not spend money on Saltmarch for at least a week. If you're right, and SGG doesn't do what is best for their income and that their believe what's right for the game is wrong, then you should have it easy to convince everyone. I mean, if it's so obviously that what SGG is doing is bad for the game, and everyone knows it, it should only take a little push. If SGG sees how their income is stagnating and how you have been the driving force behind it, then they will listen, because suddenly cheap words spoken by anyone had consequences.
If however, the majority ignores you and still buy Saltmarch immediately, it shows that SGG seems to make enough right decisions for their user-base to pay their rents and their food. Then it shows, that this was just than one opinion, that needs to contest with every other opinion like everyone's else.
Btw, SGG even given any credence to the forums is a big plus for them, as it sets them above about every AAA company in existence. Often enough, users have no say in how a game developes.