Oh, keep the frustration by all means. For the very reason you cite. When I started off, shooting film that provided 12 frames/roll, I was happy when I reached a point where 1% of the frames provided me something I considered worth while.

Which, since I also wanted to be a nice, frugal fellow, kicked up the frustration level on not wasting film!

It is, in the long run, a two-part answer.