Well, I'm probably not the usual guy on this site or in the general population. Nor am I in LTR, so not sure I'm what you're looking for. But who cares, let's give unsolicited opinions anyway!
I do casual dating for two broad reasons.
Firstly, it's fun, easy, convenient, good for work, etc.,
I wanted to go out Friday. First girl I asked was busy, so I went to the next name on the list. Easy.
Having different girls to choose from, and get to bed...lots of fun! I also expect I'm not the only guy that they're dating, so I'm no hypocrite there.
Also, I have girls for the environment. One girl I know, no tats, pretty, in med school, intelligent, she is the family/work date, because she fits the environment, coworkers won't judge me, knows how to talk, etc., Other nights, I'll be playing football in the ghetto, or my teammates will invite me to some club or bar in the ghetto (where I stick out like a sore thumb), I know a girl that is much more comfortable in that environment.
I also live a busy life. Work, travelling for work, my football hobby, that takes a lot. I doubt I can give a girl the time or whatever else she wants from a guy. I don't expect it from anyone I'm dating, hence, why I have multiple.
Second reason, I feel like it protects me.
I've been emotionally destroyed by my parents, and already had an ex that cheated on me.
While some girls try to get all...emotional, and...whatever else with me, even though it's casual, keeping it casual keeps me safe. I don't have the heartache when one tells me she met someone. Or when another ghosts me. When the girl I asked out Friday said she was busy, I wasn't busy thinking "Oh, is it another guy? Is she sleeping with him?" I just said that's fine, and went to someone else, and had fun.
Now, if you asked me would I ever stop and pick one, certainly. The clean-cut medschool girl, I would really like to. But why does an east-coast, pretty, future-doctor want some nerdy, mid-west accountant guy? I imagine she'll wise-up and eventually leave me when she meets some other guy, probably another doctor, in her practice, that's older and more successful than I can ever be, so I'll just take what I can get in the meantime.
So casual dating it is!