I think you're taking this way too personally.
I'm imagining a guy with a family to feed, no job and red letters coming in every other day demanding cash he hasn't got. Blagging an interview, even if he has little chance of landing the job, and an elevated chance of getting fired in the first couple of months, is better than sitting on his ass, whining about the economy.
Your trying to buy labour, and he's trying to sell some. This is the real world, and trade is adversarial. A tree-surgeon knocked on my door today to tell me that my tree is going to bring down the power line, but he could sort it for £100. It's not a power line, it's the old telephone cable. I don't resent him for trying it on. I thought it was good fun.
Once someone is a part of your company, with a real stake in it, they owe you honesty, loyalty and commitment. Up until that point, it's dog eat dog mate. Perhaps you shouldn't be interviewing on your own.