It is an interesting thought. Here is the problem, though:
MOST drummers have a kit that they can practice on for free. Even when I just had my Pearl Exports, I wouldn't have paid money just to go play a much better kit. I can't imagine most people would...maybe once, to try it and see the difference, but I don't see how you would get repeat customers. "Hmmm...I can pay this guy $10 a week to play his kit for a little while, or I can put $10 a week aside, and in 3 years have enough to buy my own kit that is as good as that one."
You have the same problem with teachers. If you want good, established teachers, then you are talking about guys who are already teaching, meaning that most likely, they have a place to teach. Why would they agree to give you a cut of their profits (which is how it usually works when a teacher teaches at a place...you don't pay them, they get paid by their students and then you get a small percentage of it, at least in my experience), when they can just keep doing their thing without paying you for it?
The people who would be mostly likely to use it regularly would be real amature guys who want to try out drumming, but don't know if they like it; real amature teachers who want to try teaching, but don't know if they like it; and joyriders who might want to try to use expensive gear once, but then would rather save to buy it than keep paying to play yours.
Also, two final thoughts: 1. What's the point of mic'ing the kit if you can't record there? I get that you are talking about turning it up, but honestly, if it's just a drummer in a place, you don't need it to be amplified. Everyone in there will have to worry about mixing, feedback problems, turning up or down, etc. This would also cause a real problem when you expanded to more than one kit at a time, sound-wise. 2. Allowing bands to practice there could get you in trouble, unless you spend a TON of cash to soundproof it, because even businesses have to follow local sound laws, and it sounds like you would be giving them the chance to play loud.
The rent, all utilities, soundproofing, the replacing of broken gear (I can't imagine even top of the line cymbals lasting long in the type of environment you are talking about), liability insurance, potential theft, salaries of any staff (I assume you're smart enough not to just let people be in there alone), and the problems I listed above, along with the down economy, make this seem like a really bad idea.