I don't regret the time I spent achieving (some of) the goals I set for myself in RS. I do regret that I put so much effort into it. But it's not like I had better things to do anyway so nothing of value was really lost.
Does March 05 count as old timer at this point? Either way, I don't play anymore. Miss the TIF community every now and then, though. I definitely lost interest in RS after skill capes came out, despite grinding for 2 of them afterwards.