That would be three tourney's on Ottertail and they've been doing so for years. I say this, because if you've been out lately, the fishing on Ottertail is much better than it was 10 years ago.
Regarding kill rates, the first tournament does very little to the lake. The majority of the fish come out of less than 10 feet of water and it is typically plenty cold enough keeping kill rates at a very minimal number.
I'd like to see where you live to see them along the shore the next morning. If you have more than 2 or 3 shoot me a message and I'll swing by and change my tune.
In all honesty if you're wondering what is bad for the lake, I can give you plenty of answers to that question. The lack of a slot or signs promoting a slot is what hurts the lake. I was putting in at the South access the other day when I spotted a 25 inch walleye that had been filleted out and dumped right next to the dock. If you're worried about the lake, throw all fish above 18 inches and below 14 inches back in the lake. Winter fishing takes its toll on the lake more so than anything as people keep most everyting they catch and often times take fish from out deep. The third scenario would be the guides who take multiple limits off the lake each week. I've counted numerous guide services this summer and to their credit, they at least manage the fishery and let the bigger fish go.
Tournament fisherman are very good at catching fish and are very good at taking care of the fishery. I have read numerous reports on the issue and have no idea how many fish end up dying upon being caught, but do agree with the argument that if 1 out of 10 fish caught dies, roughly 30 fish die each weekend (based on 300 fish being caught in a tournament). Of the 50 teams in this tournament, 5 would probably be fishing the lake on a given weekend and would easily take 30 fish out of the lake which in my opinion cancels if not completely eliminates the argument that tournaments are bad for the lake.
Everyone uses the lake for different reasons, and though I may disagree with winter limits, jet skis, guides, tournaments, or other frustrations, we must respect the fact there is a time and a place for each as well as a discussion based on facts.