I don't like coins less than 50% stake. They can get rocked by the market easily. One downswing and you will never recoup your losses with stake. If you're going to keep them, do so because you think they will become popular/appreciate. The stake is just gravy then. For ex I mined Fluttercoin in the beginning because the dev is super active. I'm holding on just because it is popular not for the small change stake of 5%.
HBNs skyrocket makes me wish I never sold of my 30K...oh well I kept a lot too and it is growing.
From your last sentence you are just speculating, which is OK but don't misunderstand it as investing. POS coins are worth investing in because they are secure. Paste something over from another thread:
The purpose of POS is to secure the network. POS reward is paid to secure the network by minting. High % return of POS is just a self-diluting game that puts a downward pressure on the coin's price, hence doesn't offer real return as "interest".
POS reward
should be very small because it really doesn't take a lot of work to mint. Over-rewarding is just printing money.