My standard quality work is on 11x14 from 4x5 negs
When I just want to see a picture, I print smaller on postcard stock.
When I do that, I produce prints of lower quality.
For example, some of my gallery shots are scans from a postcard (they are reductions).
The postcard prints are straight prints with no manipulation because they are so small.
At least my 11x14 prints have burning and dodging, which I think (by definition) makes better prints.
So that's why my smaller prints are lower quality.