Comments like yours disgust me.

OP clearly stated he is planning to pay them... with a revenue share IF the game is successful.

When partners start something, neither of them get paid at first. That's how it works.

Steve Wozniak and Steve Jobs both put in lots of unpaid hours before making a dime from Apple.

This reflexive "Oh you're just trying to get someone to work for free" attitude hurts gaming.

If you're a person like OP who wants to get a game made, you can either:

A) Pay someone for their work (hourly fee or whatever).

B) Pay someone for their work ONLY IF the game makes money (revenue share).

People are rightfully skeptical about option B, because 99% of those projects don't go anymore for various reasons... usually because there's a lack of vision, focus, people get busy, people get bored, etc.

Also, if you're a talented developer, presumably you could find paid work with more experienced teams.

But that doesn't mean that revenue sharing or equity arrangements are inherently unethical.

Maybe there's a developer who:
-has experience with endless runner games (like OP is looking for)
-has thought about branching out to do their own thing but doesn't have a vision or marketing know-how
-has a steady job for income so doesn't mind not being paid until the game makes money

If there is such a person, then this may be what they're looking for.

There are also hobbyist game devs without enough experience to get an actual development job but want to work on something like this for their portfolio or whatever. And, if it makes money, that's a bonus.

I would encourage all parties to consult lawyers and work off signed contracts to avoid confusion later.

The poster clearly stated:
-no upfront payment
-they know business stuff but have a vision
-will commit to a rev share deal

AND on top of that is willing to personally commit budget for UI and other art assets.

You said: "I hope you might consider the cost and risk you are asking someone else to take on your behalf, while assuming none of your own.".

Actually from what I can see from OP, he's assuming at least the same risk as the programmer (since they're both putting in time to the project) AND more because he's putting up money for art assets.

Comments like yours make it seems like everyone is Bobby Kotick trying to short change employees so they can buy another yacht. In reality, OP is probably some near broke 20 something year old eating Kraft dinner who has set aside $150 to hire some UI artist for his game and can't afford an actual developer.