I think a great idea would be packages - combine gear from one vendor, a AEG package from another vendor, upgrades/work performed by another vendor, training from WillowRetreat and something else to make a complete 'purpose' package.
- Skirmish Package
- MilSim Package
- Excursion Package
- LRRP Package
I know they use them in Paintball successfully, why not Airsoft? Provide the player everything they need - paid game voucher, etc etc etc. We're a bunch of smart cookies - we could fill those 'packages' pretty damn quick. It all comes down to 'best practices'. Even go as far as 'Silver-Gold-Platinum' packages I suppose...