I don't know nothin about purple martins, but I can tell you this. Birds are addictive. It starts out innocent enough; you're just gonna put up a house for them to live in. Then, you're just gonna put out a little food so they don't have to work quite so hard to make a living. The food gives you a chance to watch them closer and get to know them. Before you know it, the hook is stet deep and you're a certified bird-nut. Next thing you know, you're delaying the purchase of some woodworking tool so you can afford bird food. I tell ya' friend, it's a slippery slope. Me, I don't have it too bad. "I can quit anytime I want to, I just don't want to."
“We should be careful to get out of an experience only the wisdom that is in it and stop there lest we be like the cat that sits down on a hot stove lid. She will never sit down on a hot stove lid again and that is well but also she will never sit down on a cold one anymore.” - Mark Twain