As for costs in producing widths, that is exactly what it is all about. Shoe companies are not going to invest in weird widths and lengths if they can't sell the merchandise. Expensive shoes are offered in a wider range of widths, which is one reason why they are expensive shoes. The costs of unsold merch is figured into the sale price. You can still buy two pairs in different widths or lengths, no salesperson should be stupid enough to talk you out of doing that! Most people have one foot slightly larger than the other. Right handed people tend to have slightly larger right foots, and left handed, larger left foots, but hopefully the difference is minimal and can be compensated for by finding the right pair of shoes to make up for this difference.