You are missing the fact that the razor is probably going to get dull by the n-th member, for example. And that people might just dull it with stropping on the first try.
Also - while this razor might shave great, we have discussed variations between same model, etc. razors - so it is not guaranteed that the next razor (that you will want to buy after testing this one) will be as great. Of course, it may be even better :y than the one that was tested - this is the ideal scenario
Also - if we have 20 members or so - some will have to wait for months! I know where I want to be in the evaluation turns ;)
I am sure other things are missing too but this is off the top of my head
Having said this - I'd pay some $ to try one such razor. ($35 is ~ fine, $60 will be too much maybe)
Cheers
Ivo