I've been here for 5 years, though I didn't become consistently active until several months after joining. I had a falling out with a different writing website and came here as a sort of fall-back. I didn't stick around for the money (it's a bit of a trickle), rather I stuck around because of the variety. For the most part, HP let me write whatever I wanted. It didn't need to be in a specific format or about a specific subject. While I'm sure they're a bit stricter now, I still feel like I can write about whatever pops into my head.
And I also liked HP because they were very honest about how the money worked. They disclosed their cut, pointed to which places paid for ad clicks, and they didn't make impossible promises about getting rich. I feel that it's this sensible management that has kept HP alive when other writing sites have failed. I sincerely hope that continues, but I know that google updates keep cutting HP off at the knee.