Yes, we pay ~30% of first year comp for traditional agency hires. Granted, they're doing more than simply flagging candidates of interest, but if this product is successful, I'm just as willing to pay 10% or 15% as I am 5%.

5% is so low it makes me question their approach.

The thinking goes something like "if the approach works you could charge 5x for it & I wouldn't blink, so why don't they?"