There's definitely a market.
There are quite a few people gaming WWII in 1/144th – 1/160th scale, and some even doing Cold War, and post-Cold War gaming.
Minifigs, Pendraken, Timecast, Arrowhead, CanDo/Dragon, Takara, and others produce lots of WWII vehicles and minis in those scales, and even more will be doing so soon, I suspect. Some even produce 3-D printed vehicles in 1/144th for purchase from Shapeways.
The offerings of buildings are very limited currently, in this scale, though Timecast does some very nice ones (limited selection though, currently), and a few others do as well.
I'm hoping that will change soon.
Model Railroad companies also produce European buildings in N-Scale, but they are horrifically expensive, costing as much, if not more than the far larger 1/100th scale and HO scale building from the same manufacturers.
1/144th scale buildings are only about 1/3 the size of their larger 1/100th scale cousins, in you run the numbers in all three dimensions, e.g. 1.5 x 1.5 x 1.5 = 3.375, using the 1/150th scale comparison, for simplicity of the calculation.
A lot of us like the smaller scale, since you get more than twice the battlefield size compared to 1/100th scale, on the same tabletop, e.g. 1.5 x 1.5 – 2.25x the playing area.
1/144th (and N-Scale, defined variously as 1/150th – 1/160th) for European buildings is a vast, untapped market I suspect, just waiting for a few new manufacturers to step in to rectify that.