If you type in Stationary, it brings up some stationery pages. If you click to page 10 of the "Stationary" result the sites trying to capture the misspellings have drifted away and the results comes back as the correct meaning of stationary. If you type in "Mortgagess" you get pages of sites trying to caputure typo traffic. It doesn't mean Mortgagess.co.uk is worth £17,000. Most people who buy office stationery in bulk know how to spell it so sales from the numpties who don't know how to spell it or care how it is spelled will be negligible. You could argue that if you don't know how to spell stationery you don't have much use for a pen or a pad of paper and aren't likely be employed as an Office Manager buying stationery in the first place.