Perhaps it didn't come off as I intended, but I was actually criticizing all the orthotics floating around out there. Yes, there certainly are some people whose feet are just soooo floppy no amount of strengthening and stabilization is going to help.
But for the vast majority of people the orthotic just allows your foot to be lazy...and get lazier. Our bodies are inherently lazy, and will do the absolute minimum amount of work required of it (thus so many compensations in so many parts of our bodies that can end up causing injury). If your intrinsic foot muscles and the lower leg muscle that supports your arch don't have to work, they won't, and will just get weaker and weaker.
Leigh...thanks for the plug!! I'm very good at orthopedics, but wow am I computer stupid. I'm kind of impressed I can even post to this forum.