A bit, but prize money for the biggest contests is close to a million, half a million for the runner-up. There's big stakes and some people will try to get an unfair edge (see every other sport for reference).

And honestly, even if it was proposed as a joke, a bluetooth buttplug actually sounds like a good secret channel for small amounts of information if you don't mind it sitting there. You're probably can feel the vibration very well and add some bits with different vibration speeds and patterns. I feel like the shoe method would require you to have your feet still and it's easier to enforce a shoe check than an anal probing...