I have written a game client, server, and world designer. I need people that want to help create the world. I am making no money off this yet. It is a top down view Diablo style playing game where the player can also switch to a 3rd person view if they want. The game is done and being played but it needs more content.

In order to get people interested in helping, what arrangements do people think are good?

I was thinking of keeping track of work done and then paying out once the game starts making money. So someone designs a dungeon and we agree it is worth $300. Then when the game starts making money a % of that is divided between all people or teams that made contributions.

Problem: Some people will not spend the time needed for good design work.

You are correct on that one for sure. Very few ever make money, in fact game companies with funding will go in and out of business very easily. But really that point is obvious, this is the industry we are in. I think that people who want to get into the game industry have to realize this and take a chance.

People who want to do this kind of work have 2 main choices. Try to get hired somewhere in a very competitive industry, or create the job yourself. 

3 hours ago, ejthayer said:

I need people that want to help create the world. I am making no money off this yet. ... In order to get people interested in helping, what arrangements do people think are good? I was thinking of keeping track of work done and then paying out once the game starts making money. ... Some people will not spend the time needed for good design work.

You get what you pay for.

If you are unwilling to pay them at the time they do the work then you're going to get volunteers.  Volunteers tend to stick around when the task is fun, but vanish when it turns in to real work. Quality is spotty at best, and since you haven't paid them you have no recourse.

Promising money on the backend is not viable. Statistically you will never pay them.  If they think you will then you'll lose them when they realize the fact, and they'll probably pull others with as they go. 

Also, you need a lawyer to make sure rights are properly assigned.  Yes, it costs money. If you don't do it then you don't own anything they did, which makes it very difficult to do things like sell the product legally. If you try to do the paperwork yourself you'll almost certainly get something wrong (like bugs in source code written by a non-programmer, except bugs in legal code by a non-lawyer) and end up with a worthless paper rather than a proper agreement.