In response to boarder42: if I understand, you're asking what the annual dress shoe budget might be for those of use proposing spending more on shoes.
For myself, I don't have one. When I got an office position where business attire was the norm (about 7 years ago), I began purchasing Allen Edmonds. I bought classics styles that are unlikely to go out of fashion, once every 6 months to a year (when the sales popped up), until I had a rotation of 5 pairs of shoes that I can wear year round with different types of staple outfits (I don't wear a suit every day, but switch between suits and jacket / trouser combos).
For the last several years, I have simply been maintaining my shoes (as suggested: shoe trees, occasional cleaning, cream and polish), and plan to do so for the foreseeable future. I may pick up the odd pair as the years pass, but my base is covered.
As such, my annual work / dress shoe budget has, at this point, amortized to approximately $125 / year, and goes down every day (until I buy a new pair). In the meantime, I wear really well made shoes that are often complimented - a nice bump to my puffy ego.