Sometimes the only satisfaction we can get out of writing is the process itself! My first book, which I LOVED and still do, did not sell, but I had some copies printed on Lulu and my book club read it and said some really nice things.
Once you've ditched the trad. publishing route, you might consider passing out copies of your memoir to friends and family. I know a local man who went through iUniverse with his memoir and bought an ad in the paper and had his book on the shelves at Barnes & Noble. Lately my husband saw a bunch of his memoirs on the sale shelf there. It's a really tough world out there; we have to cling to whatever goody we can get out of this writing thing. I completely understand your discouragement; many, many of us do!