Actually I don't think I skipped over that. I explicitly mentioned "spinoff technologies" and in my analogy to digging a hole in your back yard I said
> Arguing that it'd have good effects like increasing your fitness and "who knows, you might strike gold!" isn't really a convincing argument for me to dig up my yard.
What I mean by this is that I don't think that the spin off technologies or discoveries from high energy particle physics research (i.e. the fitness you might gain by digging up your yard) are a valid justification for doing it.
Spin off technologies and discoveries will be found in almost any research endeavour, including other particle physics experiments that aren't just "build another collider, but bigger", they're not a justification for the research, they're a bonus.