They make more in donations when they're the minority party who shouts about things they'll never ever fucking do and decry horrors they'll quietly continue when it's their turn.
If I got a dollar for every time I got a donation message about how this time they'll follow up on promises from a decade ago, I'd probably have enough to lobby for it to happen.
No matter how many times i respond "Stop" they always try again sooner or later. It's completely ineffective now though, all I'm reminded of when i receive any of those messages is that they are lying to get money. Plain and simple.