I've been on this site before PS3/Wii. I'm not an active poster, but if you want my opinion from outside... since we don't have charts, I enter the site less and less every week. The only reason I see this site it's just because I'm used to it. But without charts I know there will be a day I'll just stop visiting because there's not to much to do for me, besides from reading in 30 seconds the last news.
Having brought about your 17th post in 12 years, I almost feel like I'm doing something right already. But yeah, the sales situation definitely is one of the factors that stops people from being more active, and as has been discussed a little bit here, there's no easy solution to this particular problem. Or well, at least I don't think there is.