This has been on my mind for quite some time now but never really felt like suggesting it until now.
As Director in Cuban Cars i'm thinking of many possible ways to get the group more activity. The suggestion below might be one of 'em.
Lower prices in special modshops (e.g. Cuban Cars modshop)
Every modshop in San Andreas has the same price and thus the special modshops (like Cuban Cars, raceTECH and Cunning Stunts) aren't really 'special' anymore. To increase more interest in our modshops, why not make our prices lower? I'm pretty certain players would have a lot more interest in using our modshops rather than the public ones, so this will definately generate more activity for the group. For Cuban Cars this would mean our members have to spawn as mechanic to open the garage for players. For raceTECH, if they approve this suggestion for their modshop as well, I would recommend requesting a gate in front of the modshop.
My thought of a lower price is around 25% discount. To show some numbers, here's what the prices would be compared to eachother: