make you spend a lot of money you could normally stockpile for the general, expose you to attacks your general opponent could pick up, alienate some potential voters, etc.

there have been instances of people raising a shitload of dough and putting themselves in good position for the general. but then getting a primary challenge and losing in the general because their resources were depleted and stretched.

but this isnt really just about primaries in general. this is about people in congress supporting primaries against their caucus mates.

its like an nba player actively trying to get a teammate traded. im sure you can see the issues there.