Nice work, Andrew. I, too, am a big fan of the quality if the work you achieve. Vrsf, n54tuning.com, etc can all copy the design.
I wouldn't loose any sleep or fret about market share, because:
-nobody can copy quality and customer service
-people that want to put $300 downpipes on a bmw that cost $50k probably only paid $20k for their car
-don't cater to those used market forum members.
There (was) a lot of quality forum contributors here over the past generation if the e90. Now, the n54 is used, except for the iS