All of the results are free to everyone who participates. The "paid membership" option is primarily there to make it evident that there is a benefit to participating. Hardly anyone takes this option.
Since nearly all memberships are free, I don't have money to pay for sponsorships. What I can do, if this forum is interested, is refer people to it with prominent links.
As for the sample size, a large sample size isn't necessary, but would certainly be nice.
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