The fretboard is in dire need of a design/usability overhaul if they want to get numbers up, imo. Because of that, I think there's still a gap in the market up for grabs since the demise of musicradar. I would guess that musicradar had significantly greater numbers than BC at its peak... that's a lot of unfulfilled GAS.
MR had sales, wanted ads, and parts all in the one forum - it sucked!!! These should be split up imo. BC has a far better structure imo.
New users on a new system should probably not be overrun with too many rules at first - remember that the rules here (48hr bumping, prices for trade items) came in gradually over time as a reaction to user behavior.