Vision
Amazon / Upwork hybrid where all the sellers/buyers/freelancers are EAs.
Why
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Many EA run businesses would offer better deals to EAs
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EAs trust each other more than strangers
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The cost of being a bad buyer / seller are much higher (so people behave better)
Details
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10% commission to cover running costs, all proceeds fund community projects
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You can only sign up via a refferals (once initial users recruited)
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Classic stars out of 5 rating system for rating products/services
How to vote
Agreevote on "yes" to vote yes
Agreevote on "no" to vote no
I agreevote YES (hope I did it correctly).
Maybe "marketplace" might not be the best word to describe the service considering the (probably) limited number of people that might use it.
But IMHO you don't really need to have thousands of users for a project to be useful or worthwhile. Even without large numbers of users, if lots of EAs know about the "marketplace" and make use of it regularly and it becomes a kind of goto hub then it would still be effective enough for its original purpose despite not having thousands of users or massive scale.
As long as the platform can be sustainable, I think it is worth a try. Aside from the few examples given in your reply in the comments, there are probably lots of other stuff we have not thought about.
In summary, even if this does not have thousands of users and/or scale, I would personally love to have a central location where EAs know to go to find such services and service providers. With enough info about it, I believe people will find it useful.