It's hardly "High risk, high reward" if you set it up properly. You can easily set it up so that when it gets too hot, it automatically turns itself off.My first reactor was not type I, it was type blow-up-everything. I quit that game. High risk, high reward.
I don't blame you for quitting though. I probably would have been in the "don't want to play any more" mood for a day or so if that happened to me. Then again I only tend to use reactors for making nukes now.