The VW forum I use does something like this occasionally in the form of ‘Group Buys’ and it generally works well. The way it functions is that someone negotiates a bulk discount rate with a retailer/supplier and undertakes to coordinate the whole thing, usually starting a forum thread and seeing who’s interested etc.
Sometimes the organiser might have everything delivered to him or her in bulk then send the stuff out to individual forum members, other times it’s direct from the supplier. There are also suppliers who’ll give an ongoing forum discount, so any forum member can get 10 per-cent off.
Setting up as a retailer is a ridiculous idea btw, I don’t know where to start… The group buy thing works well and also means that different people organise different buys, so the workload is spread.
I don’t know if it’d work here – you’d essentially have to be able to undercut the big web retailers and they’re already priced competitively – check out the cost of built wheels relative to the component prices for example…
Anyway, just my tuppence worth 😉