How does this work from your perspective? If all the site's income comes from players' losses, aren't you concerned that with that system it could kill your profitability?
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It's possible for a player to wager huge amounts and break even or even make a profit. In such cases I would expect the house to be unable to pay the referral fees. But in general the site expects payers to lose 0.5% of their wagered amount. They take 10% of that in commission (I guess - I don't know that I've seen that written anywhere), meaning they expect to get 0.05% of the wagered amount. And so they're giving 20% of their expected commission to the referring player.

I notice that the 'Copy' button next to my referrer link doesn't light up when I hover over it like all the other active buttons do.