Ajax Aggregator Sites – Why Are They Springing Up?

Of late, I've seen a growing number of Ajax/DHTML/JS component aggregator sites popping up on the net. The first one that I noticed was MiniAjax. Then I found another one which was even bigger called Ajax Rain. And then tonight, I find Ajax Daddy.

All appear to do the same thing; display a collection of Ajax/JS/DHTML components but I'm not sure if these sites are built to simply be a showcase or as a method for driving traffic for future monetization. I haven't seen any Google ads or banners so I'm a little perplexed.

For now, I'm going to take advantage of these cool sites and pick off the great components being developed out there.

If anyone has any ideas as to why these were built, feel free to weigh in.