I believe finding that sweet spot will be key.

Do they provide ID to anyone? Do they require any sort of external verification? Is it a premium price? There are many factors that the community will come to value over others. The market will decide these as time goes on and more competition enters the space.

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exactly, and different people will value different things. A student might want to verify as @harvard.edu as a status symbol. A doctor might want to verify with the AMA. The possibilities are endless

Absolutely. You get it. Bullseye. 

I agree, those are some valuable parameters to start with.