The difference (after taxes) between working for minimum wage and receiving SSI is $35/week...much of which the worker spends on transportation. There's no way on earth I'd flip burgers 40 hrs/week to net $35.

I know SSI isn't welfare, but there are more people on SSI because it's an easier benefit to receive. You'd be surprised at how many people you think are "on welfare" who don't actually receive TANF.