When I first started online dating five years ago, I put in a ton of effort in my replies/messages, except I rarely got any replies. That was pretty sobering.
I still put effort in my replies/messages, but I got used to just one or two sentences rather than an actual paragraph.
A good female friend of mine complains about how guys in online dating can barely hold a conversation. I have said to her, you have no idea how many messages your average or below-average (in terms of physical attractiveness) male has to send to get a date, let alone a response in the first place.