Like most have mentioned, everyone has different reasons why they are not more active on the forum.
For instance, I was just talking to my oldest son the other day about the forum (that's how I came up with this thread
) and I mentioned to him that I had not seen him on the forum in a while, and he said that lately there's not much going on in the e90 section of the forum that interests him so he and his cousin have been spending more time on another forum.
They're in their mid to late 30s and used to be active on here for a few years. Not in the OT section, mostly in the tunning, modding, coding, etc. section of the forum.
He said that with the newer car platforms things have changed and that the other forum has more members actively involved in their platforms.