150% sounds absurd for staking reward, I can't see how something that offers that can be sustainable. I think the staking reward that is being discussed for when ETH goes to PoS is only a couple of percent.
maybe few coins will give about 150% or more rewards for stakers, but seems to risky if we invest in a kind of project like that
because normally the stake rewards for a serious project is between 1% - 10% per annum, and usually the rewards will decreasing each years my friend