As David pointed out and FL MLS data support, less the 30% of listed short sales are purchased by a resident homeowner.
A real estate professional who has successfully closed a number of short sales with a few different banks will have a feel for what the end game will be. This is based on experience. It is well noted by the comments below that short sales are the "Wild, Wild, West" of real estate. The illusion of rules and predictability result in an 'anything goes' environment.
Added to the anarchy of the short sale institution is the personality of the buyer creating a real circus. It is critical the buyer understand the short sale process, how very little influence the buyer exerts, must be extremely patient, flexible and ready to respond on short notice. And, in many cases, be willing to invest their money into an situation with an uncertain outcome. If this doesn't describe you, it also does not describe most of those who attempt a short sale purchase.
Because so much of what takes place in short sales is secreted behind the closed curtains at the bank, the service company and investor, there is an incredible amount of trust required between you and the professional representing you. Everyone advised you that bank owned or traditional sales are the best route to take. You chose to make an offer on a short sale. You will come to realize....what you have read is true. If your agent is a real pro...they will make it look much easier than it is. You will need to invest some trust in your agent. If you close on a short sale, it will be close to a miracle. I believe in miracles.
Best of success in the purchase of your new home.