Also, you need to realize that sometimes the players just don't want to do your run, be it an IC or OOC reason. You should also have some sort of "backup-run" for that, in case something like this happens again.
I have to disagree with this.
I'm not a perfect GM by any means or standards, let me announce that openly (not that there was ever any doubt). On my forums I have 3 rules posted that are the foundation of everything I believe in, RPG-wise:
1. Wheaton's Law: DONT BE A DICK. People underestimate just how far this rule stretches.
2. Trust the players.
3. Trust the GM.
In essence, if I spend the desk time to write you a mission, saying something like "I'm too pretty" or "nope, not the kind of run I'm interested in" is really a violation of Rules 1 & 3. I wish I had the link to the original article of which I extracted these rules, but the long and short of it is that sometimes you (as a player) have to do things with your character that are "out of character" because staying "in character" would force you to do prick things, usually agaisnt your own teammates. It violates rule 3 because trust needs to be mutual. If you dont trust me, I cant trust you. If I have a habit of screwing you over in missions because I'm too heavy handed or just outright evil, then *I* violated rule 3, not you.
I dont disagree that there should have been more involvement from the players in the setup of this mission, though. As for the claim that this is low-pay ... well ... that is going to vary from table to table and should vary (IMO, anyway) on the current total karma of the character. Higher total individuals will want more money than a new group of aspiring runners.