Don't know if a MN is actually rewarding enough to pay for a vps
It depends on what are your preferences and what do you need. If you want to run VPS only for Cosmo Coin, it wont cost you that much...
Well, according to Cosmo coin specs, which are:
POW/POS: 35%
MN: 65%
Masternode Returns:
Month 1 = 1150% APR*
Month 2 = 850%
masternodes should bring more than staking. I would say that wherever you can stake 24/7, you can run a masternode 24/7 as well.