My hypothetical response would be to give in to candidate B since he/she is known to be a good person and you've been known to despise trapos. My real response, however, is to provide your services to the higher paying group since this is a business despite the fact that you've been known to despise trapos...
One way of looking at it is the case of GMA-7. They've been known to be "walang kinikilingan, walang pino-protektahan," "serbisyong totoo," with a kind of "goody-goody" image. In spite of this, they allowed all the ads from candidates even before the campaign period began and everyone knows that's not "proper" but because the ads didn't contain the words "Vote Me," pwede na rin. Don't get me wrong, GMA-7 is the only station I watch because of this image. It gets to me sometimes but what can I do? In the end, what's good for business is good for the businessman.