Why don't players that support a family on their golf skill know there is no magic bullet? I have no idea.
I don't think any of them think there is a "magic bullet," but they just don't know what the proper prescription for their particular affliction is; so they search.
It can be tough to see the truth when you've won a tournament under a certain label. Both Baddeley and Weir won under those guys, and now both have left.
You know what? I've won a tournament with my only warm up being a large coffee and breakfast sandwich...that doesn't mean it contributed to my performance.
I remember one year at the FBR Open where Jeff Quinney was playing very well for a few rounds, and they kept making a big deal about his swing changes. Well, if you looked at the stats, he was leading the tournament in putting! Then he pull hooked one into the water at 17? and fell out of contention.
Some times you can do well despite your swing, not because of it.

This post's train of thought may be tough to follow, but I hope I got my point across.