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.