An active tester is someone who took a build this month. Each one is a watermark identity, a signed NDA, and a stream of reports to cluster — which is to say, each one is the work. Developers on your team are unlimited on every tier.
Three models were considered and dropped first. A price is only credible next to the ones it beat.
Per developer seat
The value does not move with it. A three-person team gets the same collapse from the same playtest as a fifty-person team, so seats would charge the studios getting least the same as the studios getting most.
Per report
That charges for the behaviour the engine wants more of. Clustering gets better with volume, so pricing per report would price against the thing that makes it work.
A cut of tester rewards
There is nothing to take a cut of. Coins are claim tokens for perks the studio provides, with no monetary exchange mechanism — inventing a cash flow there would make a developer tool into something it is not.
One campaign, 50 testers, and a link you already have — nothing of yours reaches our servers. Move up when you want the build hosted and watermarked, not before.