Then be bigger and better than the outsider, We have Tarmac and Torqen on board who can supply basically any product you need. yet I guarantee most people would still send people to driftworks for say wheels because Driftworks have become a 'household' name for anyone in the Uk tuning scene.
The simple answer is, become that household name even if its within this community for your work, This may sound horrible but the members owe you nothing, you really need to push it like the two traders I mentions have to become the names people say first. not saying anything wrong with your work or service but you need to be out there more.