Well let me chime in here.
First off, anyone who is in the business has gone down the same frustrating road you're on now. It's sort of a right of passage.
Having said that, you're also facing a poor timing issue. When I first started as an investor in 2009, business was great and it was easy (on a relative basis) to do deal with no money. I was buying short sales and doing back to back closings with none of my own money using 100% transactional funds from easy to find transactional lenders at 1.25 points only. Most times, we were the only buyers for those short sale, so the banks had little choice but to sell it to us at a great price. And, by the time we received an approval, we already had a buyer in tow. Those were the days.
Fast forward to today and all the short sales and REOs are competitively bid up to retail value and banks are not likely to discount.
Then, as the market improved over the last couple of years, seller expectations have changed so if you're doing direct mail, you're finding it more difficult to find sellers willing to discount their properties for a quick cash transaction.
So, some of this is not your fault at all ...just a timing issued.
Remember, the best of times are the worst of times and the worst of times are the best. That adage has never been more true as it is relative to real estate.