We do it because we're lucky to get even 1 match at all. I've used POF for about a month. Maybe 3 total (because I used it a few years ago) and in total probably gotten about 10-15 matches. And I"m lucky to get 1 reply after about 30 messages so some of us unfortunate guys just swipe right indiscriminately and IF WE DO get any matches, we just pick through the weeds. Usually swiping everyone right isn't enough for me though. Same with Tinder. Swipe right on all of my daily matches and still end up with nothing. When I do get matches they are usually spam bots or morbidly obese girls with like 6 kids.
This is the main reason I don't like swiping apps. It's such a waste of time and one sided because the guys ruin everything from their end. They completely defeat the purpose of the app. We can never tell if a match is real or not because they ALL do it. Girls are literally the only ones putting in the work and picking through individually.