Good idea. I wouldn't mind buying regularly though. By regularly I mean buying when Bitcoin is down and selling some/all (if you want to) when it's up.
I believe this can be done automatically now as I have seen few members promoting services like that here
Yeah, that's what you'd ideally do, but this gives people room for excuses like "it's not low / high enough to buy / sell" or that they simply didn't think about it or didn't pay attention. Automation is the beauty of the entire thing. Coinbase is a pretty legit player that offers recurring purchases. I'm not affiliated with them, I was just very happy when they started offering this.