@Matt M. might be correct ... there are horror stories in every industry. I could get a book published with horror stories by Full Service Brokerage ... several volumes). In Flat Fee listings it does not depend so much on the company because each deal is handled by the individual seller; So it isn't the company's fault if you have had 3 bad experiences. Without knowing which company you are talking about is impossible to verify stats.
For experienced seller, like the ones in BP a Flat fee MLS listing service is by far the most profitable way for selling their properties. there is the normal push-back from agents because they think they are loosing listings to them, which is not the case. Less than 1% of listings use Flat fee services.
The Flat Fee service is not for everyone, but investors that know what they are doing should save the listing side of the commission 8at least) ... it is all about cash-on-cash and profit.
Commissions are calculated on the entire sale price but they come out ONLY from the equity of the seller which disproportionally affects the COC of the deal.
To get a reputable Flat Fee Listing Company make sure that it is licensed in your state (we aren't sorry), that answers the phone and answers your questions. Do not use any of the referral services out there (most of them are referrals) because you loose control. What we do for reviews is hire an independent, google-approved, company that collects the reviews from actual customers and we have no way of manipulating them ... they are what they are. Don't trust sites that publish "reviews" on their own or collect reviews directly on their site - those are in most cases bogus reviews.
@Kyle Doney will be able to find a good Flat Fee service, sell (or rent) his properties and BOOST his ROI and COC dramatically ... it is a no brainer.