Never let your conscience get in the way of profit. A good contract is one you can manipulate in your favor. Anything worth doing well is worth doing for money. Try to get whatever is possible free on the Net, and then resell it. Regarding your customers, everything they get for free is worth what they have paid for it.
Every profit is worth the profit.
There is no excuse for non-profitable activities. One man's spam is another man's bulk mailing. A sense of profit can't be learned. It's in the lobes. Never cheat your customer, unless you can get away with it.