Is the LP/hr still worth it? Could enough isk be farmed to buy a PLEX and sustain itself? I understand this was a popular practice back a few years ago but has it changed since?

I COULD BE WRONG. I don't believe it is anymore just because PLEX cost has inflated a lot over the years. (Currently 1.2B each). I know when I was running FW 3-4 years ago plex were bouncing around 350-450M.