I pretty much the same way about that kind of game, but I'm pretty good at shaking it up.

They haggle for things people might be willing to do for free? Someone does do it for free. Have rival "teams" that are willing to do things for cheaper/free. Force them to drive their prices so low that they start to have genuine money trouble.

Or, have the people they help get into even worse trouble because they paid everything they had trying to afford the PCs, and now they can't afford to pay anything to solve the next problem. If the players don't care from a moral standpoint, have it affect their business. If people know the players drain people dry and leave them worse off than they started, they aren't going to bother hiring them.

Also, you could have someone set them up. Have them do a really well paying job, that turns out to be not what they thought it was. Lucrative courier milk run turns out to be a smuggling run for the Black Sun. Or have the only jobs that pay well be completely against what they believe in. Have the Empire start indirectly offering them work. Have them hired to stop raids on trade caravans, only to find out mid fight that they are protecting slave transport ships, and the people they are fighting against are trying to free them. If they don't switch sides, they are not only terrible people, but no one is going to come to them with jobs that help people, and they are going to get tangled up in the tyranny/crime of whoever they were really working for. If they do switch sides, they have a powerful organization with a vendetta after them, and no more lucrative jobs to help fund them.

Another way to deal with the money thing is to give them more than they know what to do with. I once gave a group the equivalent of a billion dollars. Not only did they never worry about how much money a job payed ever again, but I got so much good material from them trying to keep/spend it. Buying things that are millions of dollars is tricky. Is the person going to try to rip you off? Are the goods legal? Keeping money can also be tricky. Taxes, thieves, con artists, charity cases. Basically anyone that knows about their money is going to want it, and people start doing crazy things when that much money is involved.