CiC

The CUP weapons aren't as good as what we have in and we have a decent amount of everything and you then need CBA_A3 to run CUP so 2 mods for 300 weapons/items and all the bugs associated with CBA just aren't worth it (plus for cup vehicles you need to add CUP_units and vehciles so 2 more mods again, here's a rough counting of our traders atm

500 weapons/items from RHS/RHSUS
450+ weapons/items from MAS
175 weapons from HLC
700+ weapons/items from Exile
50 weapons/items from Arma3 and expanding this one all the time as it takes no extra mods (should get up to about 300)

This doesn't include:
175 Arma3 vehicles
2 Custom planes
300 Exile vehicles
100 Mas vehicles
250 RHS/RHSUS vehicles

If we were to add any other mods it would need to be very special and give something else to the game play i think rather than just adding more items

I agree, more vehicles would make trying to decide what vehicle you want very difficult, as if the attack helicopters didnt make missions easy enough already. main battle tanks really wouldnt add anything to the game.