I have no problem with paid updates, I've bought all the modules for "Combat Mission Shock Force" even though I hardly play the game (hate the Syria setting) - just to get CMx2 Normandy
I guess the business model from CMSF would be feasible for a game like SoW:BoB as we are in a niche market... Release a base game and then rather fast to produce modules with "plane packs" for the same base region. RoF tries a smilar approach but I would rather pay 25$ for a 1941-1943 channel war module with FW190:s, Spit V:s etc than 5 dollars for each plane etc...
/Mazex