The only reason to use any of these is to catch your own bait and save money.
My crab pot has paid for itself many times over on what I would have spent buying prawns or cray.
My next project will be a cast-net (although I need to investigate the legality of using them in NZ)

Spotted this yesterday at Aropaoanui

From Fishing Album

If I can catch a few buckets of those I can cut back on buying bags of pilchards