[whitebandit]

"people are rolling Druids to PL other characters and to make some coin play taxi"

You basically answered your own question there, that is likely why the number is so high. They are easily one of the easiest solo classes with no gear and have the ability to easily traverse the world in a few minutes.

Druids will almost always have trouble finding a group unless you know people, an LFG druid is not high on the priority list for almost any groups ever, This is coming from a long time druid. Druids certainly arent horrible in groups by any measure but people are looking for classes that excel in something, druids are jack of all trades to an extent.