The problem of quantity v quality is always going to be a difficult one and probably a paradox. We mostly learn about quality shoes as we go along. We start with appreciating lower quality shoes and only wake up to quality, later. This leads to quantity. If we only knew then, what we know now - and if we were rational - we would limit ourselves to, perhaps, four really good pairs of shoes. But we are human and learn slowly.
All this, of course, is wiped out if you have seemingly huge amounts of money, so that you can quickly switch from 'poor quality' to 'top quality'. At a guess, I would imagine that many people don't fit into this 'cash driven' category. As with all of these things, I may well be wrong. For those of us with limited budgets, though, we buy what we can.