I don't know... how different is it really from the general "you have to kiss a lot of frogs" mentality of finding a couple or single that is a good match for you and isn't a fake or flake?
Yes, these guys are looking quick, easy, no strings attached sex and they don't want to put in any real work to find it (beyond sending out lots and lots of copy n' pasted messages that say "hey, wanna fuck"). Yes, they are exactly what gives single men in the lifestyle a bad name. Yes, 99 our of 100 of us will turn them down without a second thought... but for that 100th couple, for whatever reason, these guys may be what they are looking for.
You're not wrong. At the same time, when my wife and I used to go to clubs, we were totally there for the no strings attached, one night hook up with some agreeable anonymous guy... and as long as everyone agreed that was the deal and had a good time, everyone was happy. Basically, we were the sluts and we enjoyed it.
I'm not saying these guys are right or good. Honestly, I've ignored and blocked guys like this on swingers sites too. Still, if they do have a 1 in a 100 or even 1 in a 1000 success rate, who am I to judge to people who do respond to those messages with "hot dick, do me now"?