I can see where you're coming from, but you're not entirely right.
First off, the energy/key drop ratio is probability based. Because of this, there's always a chance you'll have to spend either a ton of energy to get the keys, or hardly any to get them. In my case, I've had to spend 4000+ energy to get the keys before, while with this last wave of raid bosses I only had to spend roughly 500 energy to get all the keys. Kano has also improved this probability with the last two bosses, so while some people are still simply unlucky, overall there's been a significant drop in the amount of energy needed to get the keys on a large scale.
Secondly, there is an incentive to start your own, but only once. When you start your own boss for the first time, you have a 100% chance of receiving one of the better drops, so long as your boss is taken out. However, after that, that percentage lowers to the original amount that everyone else has to deal with.
Last edited: Mar 18, 2015