Dash is going to be great with upcoming version. Axe is still very cheap and easy to mine. Pivx dev left the project so its unlikely theres going to be anything new besides light updates (and how long they would last). the rest has empty or no source code available. there were couple more i think but they didn't survive this summer i guess
Is running a master node really profitable?
I am doubtful as there are many devs that left their project hanging on the air.
Depends on coin. Most of super high ROI MN coins will just get value devaluted because of high infaltion. Same as with high PoS. You you should look for decent project that has not too high/not too low payouts. So you can pay your VPS server costs from MN income.
As AXE dev here chipped in with advice, I can recomened AXE as a good project. It's still easy to mine AXE, at least for now. Sadly it's not on any of larger exchanges so buying it will be harder. Only at freiexchange.com.