The Kochs are pledging cash support to Republicans who vote against the AHCA since they're being threatened with primary competitors if they don't fall in line and vote for the turd. Not so much because the bill is horrible, but because it's not the full repeal that was promised.
So basically they're using bad means (unlimited political contibutions) to do a good thing (defeat the AHCA) for bad reasons (full repeal of ACA).