Holding Steem during a bull trend and then selling for profit is a good strategy. Buying Steem, holding it, and forgetting about it isn't necessarily a profitable one when you consider the volatility of the market. Bull and bear trends can last days or weeks. Your losses will eventually add up and equal out with your gains. It would be luck to come out with a profit in the long term. Investing in Steem Power is a less volatile one. You earn more over time and you are rewarded for participating in the community.