One will just assume that the rich won't be bothered by pocket change amount of outstanding .

Nope, that's a wrong assumption. Gosh, because of a sum that won't probably get you a meal at a fast-food restaurant( okay, maybe a kid's meal), forked out extra time out of the busyness to settle it. And it's not as if the chance to settle it real time is remotely impossible. Oh well, c'est la vie.

Randomnly, one line found in 一指神功 came to mind upon processing of the request. Ops! Thankfully, that didn't come to pass. I'm civilized still. ;)

The request was fulfilled soonest possible.

One prosper as the soul prosper...