If someone came knocking on my door and said...
 

"I will use my own time, money, skill, and other resources to market your product (good or service), for a percentage"

I'd say,

SIGN ME UP!

And the reason is simple...

It costs me nothing up front and could result in a sale I otherwise wouldn't have had. And any size of profit (from that sale I otherwise wouldn't have had) is better than no sale and thus no profit.

It's like having customers handed to you. Beautiful.

So yeah, tell me more. Give me the skinny (fine print, conditions, whatever).

I'm in!

Michael Ross.