If short sales were readily approved, then everyone would want one. Knowing that Realtors are the weasel types (not the ones on Piggington), and that fraud was rampant and on the increase, sellers and their agents could engineer all kinds of sales to relatives and associates, for profit, at the expense of the lender.
Lender should not approve short sales until homeowners have exhausted financial means such as savings, 401k, etc..