I was thinking the same thing. I converted nearly all my Steem to Steem Power a week ago knowing that i would not be selling it and that I am using Steemit for fun, not to maximize profits for a specific post. If more people tie up their Steem in Steem Power then benefits all.

Also, in an interview with the two founders - they stated that Steem Power is less diluted than Steem as new tokens are created. So it's better for you in the long run to have more SP. I believe the more SP you have the more value your get for posts as well.