“Why not?”, indeed. I had no idea so many Miami singles were on these services. Soon, I had to chase people away with a stick. I enjoy talking to people so this kind of thing came easy to me. I'm not that great of a looker, so... even better. If I was using an app or a dating website some people might have been turned off by my appearance before getting to know me.
I've been on plenty of dates thanks to phone dating at Miami party line. Either directly, with people I talked to, or indirectly through people I talked to who became just friends. There's no real mystery to it. You just pick up the phone, dial the number and start talking. Trust me, there are plenty of people who will like you. Miami is crawling with singles looking for relationships or just some fun and quite a few of them use these kinds of services.
Don't worry about it, just get in the right mindset and get out there... well, stay in and start talking. You know what I mean. Just do it.