Not only because the price will be insane but also to see what people will do.
I think I understand your point. When Steem was at $7.00, you already felt like it was all yours. But the truth was, it was only unrealized profit, just like it is now. If Steem gets to $100.00, people will be in panic mode lol and perhaps some grey hair will appear too, but it will be this good and happy panic mode. Most st people with SP will love of off rewards.
It always makes sense to sell on the way up, but believe me, majority people usually do the opposite. On the way up they want more and on the way down they eventually panic and sell for a loss. With that said, it’s always good to take a profit just like you did today. I personally am a long therm holder and have set my plan that says when to start taking some profits (if any lol) in place.