The flip side, if you can afford to give them a little extra to show what you can do, you have likely gained a long-term repeat client.
This is true even in my situation. There's one platform, in particular, that I work wherein the site
specifically told me that I should give in to the small favors from the client because it'll make them enticed to work with me again. They were right. After giving half a page extra to one client, he came to me again for a ten-page paper. These things definitely give back to you - however, of course, the situation is not applicable in a blanket manner. Not all clients will turn into long-term repeat ones. But the thought counts. And if you're short on money and want consistent work, the extra mile counts.