A good hide and staying still once you've found birds will allow you to be much more successful than any whizz bang decoy spread, motion decoy, or whatever gear you happen to be wearing. Also hiding one guy and a dog is a heck of a lot easier than hiding 2-3+ guys.
Personally I wouldn't spend money fixing up blinds on public land, likely any fixing you do will quickly be undone by disrespectful hunters and bored teenagers. But I would certainly make note of their locations and not be afraid to setup near them. Or hunt them if you can get them hidden enough with some local vegetation.
