I like this idea. Here are reasons why: (Good form. Everyone follow my example.)
1. You get money without pking (sometimes annoying because of critisism)
2. You do something other than pk.
3. Variety.
4. 4. Four reasons.
Some things that could make everyone happier:
1. For target practice (would be hard) you'd get like 1exp and 2 money a target, therefore you'd get a "lamers pay".
2. Mission things would have a max pay-out of a certain number that fits (150ZoneGolds?) and cost 10ZG to play.
3. I only read the first post and skimmed the rest so this might be a bit off.