I have no problem with somebody making money off Bigfoot. For me, problems arise when people turn their Bigfoot organizations into travel agencies, then continue to pass off their vacations as research. Call your fee-charging expedition a vacation and I will have no complaints. Call it a scientific endeavor, and I will have serious questions. Of course, my main issue with the BFRO expeditions stems from my opinion about expeditions in general—i.e. they don't work.
The same goes for making money on anything in the esoteric field; UFOs, etc. For some reason, critics attack writers for "making money" as if that has something to do with credibility.