I stopped shooting my DSLR because I would get overwhelmed by the number of bad to mediocre pictures I have to sort through. I can take thousands of pictures, and one or two is worth keeping if that. Feels demoralizing.
But on film, most bad or mediocre shots are ones I never take, because I realize it's not worth the film. On a roll of 36 exposures, I get at least 4-6 good shots I like and want to keep, which is a way better "hitrate" than digital.
I like the idea of treating SD cards like film. I've done the same, except I haven't managed to fill my first 64GB card.