ekurburski,
As Don alluded, it really is dependent on the market in your area which you would have to investigate. In my area, I finally gave up because it is a very small market here and really not worth it when you consider all the other hassles such as working with ADs who look like they are 12 years old and change every other time you play a place. I have a friend who is still doing it and he reports a similar experience to Deane, that is the nursing homes are cutting back more all the time. But if you really want to pursue it and there are enough venues in your area it might work out.
Please don't let my experience discourage you. I would say though, that anyone doing it at this point has to "have a calling" and do it mostly for the love of doing it rather than the profit.