I agree. Tennis is a very lucrative sport for women.
Here's the payout for the US Open. (Same money as the men, but best of 3 at the majors for the women instead of best of 5 for the men.)
Semifinalist: $960,000
Quarterfinalist: $500,000
Round of 16: $280,000
Round of 32: $163,000
Round of 64: $100,000
Round of 128: $58,000