If FT gives is 27 percent...

[Yakuman]

...how much does the affilliate get?

[RakeRebate.net]

That depends on the affiliates turnover. I don't think anyone would want to share their financial records. In percentage most affiliates are spending another 2-3% of gross rake on marketing.

[BigBiceps]

My guess is that it is ~5% then subtract expenses.
I am no affiliate though, just guessing.