When people are first timers on a dating website, they tend to be rather picky.  After all, they remember when they were 20 and dating.  So, they assume that the market is full and choice.

But, that was 40 years ago and the market is no longer full.  Furthermore, what is left has been well picked over.  Once they realize what the market is really like, they tend to be a little less picky and a little more realistic.  Because of this, the candidates that got rejected early in the dating game, might just be what they are looking for today.