Misleading. They only initiate with the top 20% ("because they're sure"). Their response rate when approached/messaged falls inline with the male's desirability intersected with their own. That is, it falls linearly with male appeal."JUS B KUNFIDENT BRO!"
All kidding aside, the problem is most women find 80% of men unattractive which is ridiculous but true so your little theory that it's a higher percentage of attractive girls is kind of bull since that is implying that the average male is just unattractive. As far as your example, that never ******* happens. Sugarmama is only if hte guy is +8 / 10.
Tinder's swipe first and gender skew (at least 2:1 male:female) has made it effectively as you describe, as the top 20% of males (40/200) are enough to exhaust the pool of viable women (50/100).