Its not the likelihood of a few litres of fuel theft that puts me off, its the opportunity that it creates for some pea brained knob to drop some oh-so-funny foreign object in there that I'd be more concerned about.
Unlocking... Non-lockabe... Sheesh, you get the guys drift. Some pedantic ball breakers around here ....lol.
I put a hand full of popcorn kernels into a gixxer exhaust once. it was make the beast with two backsing hillarious.