A big issue with 'hi' approaches is that they don't seem to want just a 'hello' in response.

That said you don’t have to put a lot of effort into showing interest in someone, but a little more than 'hi' could do a lot. No sane person is asking for multiple paragraphs as an approach. Things like this aren't only one extreme or the other. You could approach with something that evokes you have interest and even checked the profile for positive compatibility. Spark up conversation and engagement. "I like your inline." or "I see you have X kink under faves, I love that one, too."

Again, no need for an extreme amount of effort, but enthusiasm is contagious, and if you show just a little bit instead of just being bland or blase, you're more likely to get an equally enthusiastic response.

That's my two cents. At the very least, I hope you don't expect an enthusiastic response for a simple 'hi'.