I agree that StuGs are significantly overpriced, but not to the point where it's a bug. Then they'd cost 80 points instead of 280 points because somebody made a typo. Just like with rocket artillery some years back, or, arguably, with the US aircraft prices.I am glad that we agree that StuGs are not just overpriced, they hugely overpriced to the point that it looks like a bug.
To me, it doesn't seem a bug, just poor design.