I have been out on Lake Michigan charters in the past. Probably 4 or 5 of them and I agree, none of them bleed their fish. When I was in Alaska, every captain or guide ripped the gills as soon as the fish were landed. Some claim that Lake Michigan salmon taste the same as Alaskan salmon but I totally disagree. Maybe that's due to not bleeding them.
I'm setting up my boat for Michigan yet this summer and plan to attach a cord with a clip on it to attach to the fish. I can drag them behind the boat for a few minutes after I clip the gills. Who knows, maybe this will even attract a few fish into my spread.