Ebay is trying to maximize sales of "easy sell" products for mobile phone users... more than half of eBay sales are made via mobile phones these days, apparently. People don't even read the listings, they look at the picture and buy.
This is of course anathema to carefully looking for specific products, models, etc. on a PC with a large monitor. If you do, you will still only see three listings per page, LOL.
Basically, eBay seems to be doing a "Windows 8" by dumbing down their user interface in order to cater to what they see as the biggest growth markets...