Well, Reprap closed down happened for a starters, so there went the Fisher Delta (thank god I bought 3...) and the kossel kits dried up, blomker stopped and cheap cheap ones flooded the market (FlSun $225 for example) But I don't get it really, I have found them so easy to build, they are strong and don't require much maintenance other than the odd belt tighten.. motors all run at the same voltage and are easy to setup.. compared to a prusa that has dual Z motors, threaded rods you have to get the steps right for etc.. they are really a breeze.

I've always gotten the best quality prints out of my delta's, so yeah I really don't know.. i'll just stick with mine
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