No hard and fast rule where you stop. In general the traffic counts more than the revenue (other than you need money to do the variations). The more people typing in the more people likely to typo. Other thing is not even typos it's visually what somebody sees and then types. For example for some reason my brain thinks "boss" so I am likely to type that. That's just me. Personally I like "bountyboss" as well for some reason. It rolls off your tongue (and that's important btw.)

I point out simply because you don't want to wait until it's to late (and of course I have no idea where you are at in this project so the advice could also apply to someone with more traction! Good luck it looks nice.).