@Shalom Afraimian Congrats on selling your deals on your own. You absolutely do not need a Realtor to sell or market your deals, and getting them on MLS for a flat fee is very easy. I have been a Realtor/Broker for almost 30 years (although I do primarily flipping and teaching others now). I sell all my flips in 7 days. I just sold a flip in 4 days, even though the market inventory went from 25 homes for sale nearby, to 91 homes when I listed. I had a lot of competition.
I grew up hearing location, location, location, but that is ridiculous. It's price, price, price. I can sell any home in any area for the right price. In addition, I can flip any home in any area and profit if I buy it for the right price.
I am guessing that your homes are not priced right if they are not selling in a fast enough time. Time is money in flipping. If you are paying on a hard money loan, each day is costing you more. In my area right now, time is your enemy, as prices have been dropping and marketing times are rising.
Where a really good Realtor can help you, is in pricing it correctly. Unfortunately, I find most Realtors (even very experienced ones) are not that great at comping accurately and moving a home for top-dollar quickly. They either price too high and it sits, or too low and you lose some of the profit you could have made.
I don't believe most of your Realtors care that you are not an agent. On my listings, I find the Realtors rarely even read what I write in MLS. I have also helped many FSBO's list their homes or flips and they all sold quickly, as I helped them price it and they have had no problems with other agents showing their homes.
Good Luck!