Thanks for your input!
It took me some time to reply, because I am in the fence if I should do it or not. It took me a lot of statistical work to define the balance between cost/yield I implemented, it was not just some random number. I like the idea that when people install this plugin, and if they talk about it, they have the same "feeling" of what is achieved, and that feeling will be lost if I let an open configuration of variables.
Maybe I could implement a radio button with another option, something like rich/normal/expensive?
Please, tell me, when you use this plugin, do you feel it to be rich, normal or expensive as is right now?
Thanks for you feedback.