An early client wants to pay for our SaaS offering using revenue share
jellicle: You're investing in his business.  You're putting up cash (the monthly fee of your software) in exchange for an ill-defined share of his future profits.  It's the same as buying shares in his company.Why would you invest in his business?  Don't you have your own business to run?Say this: "I've thought about your offer, and it just seems too complicated to get into.  I think it's best to stay with a straight monthly fee.  The best I can offer you is [5% off of whatever you offered him before]."