I like your top shelf - that's just right for bags! I'm never sure about piles of bags either, although it's fine in the short term, we want our Mulberries to last for years don't we
I have more than a few Kipling bags which I use when we do outdoorsy/boating stuff, but don't tell anyone - they pile up beautifully and squash into very small spaces
As for the dust bags - no, I don't use mine either. To be honest I can't see the point of them for most of the bags, although if I had something in exotic leather I might have a different opinion!