With Dlease.io you can still get a 13-14% ROI. And I think if you delegate to a curation guild you can look at 8%-10% fully automated.

If you want more ROI you will have to be more active. Curating well manually can give you around 15%-18%.

All those Returns are pretty decent IMHO. The problem is, of course, the stability of the STEEM price. Even though 8% is nice, it doesn't matter much with STEEM price going ever lower, you still lose money.

The reason why I still hold a fairly decent amount of SP (as an investor) are the access to resource credits (RC's) SP provides.

Every Steemian needs access to RC's. With Communities and SMT's on the horizon and the success of apps like APPICS and Splinterlands, I expect the demand for those to grow, especially with the introduction of RC pools.

If you have SP you will be able to separate RC delegation from voting power I'm told.

Of course, if you don't believe in this I would just hold enough Steempower to have access to the RC's that you need (playing Splinterlands battles, voting/posting) to enjoy the network.