Very fast reaction minigames (you know, when people ask how I can type like that—the answer is "learn to type without looking using all your fingers, and then wait a few years") tend to clump around 3 seconds, with the occasional 4, 5, or (in bigboypadilla's case) 2-second time. This gets boring quickly, and I'm not even sure why there aren't decimals to begin with. [edit between the 13th and 14th post: yeah I meant "add something like '3.12' instead of '3'"]
Also there's the question of what to do with reactions that have someone getting 2nd place by just a few ticks:
FWIW I actually haven't yet bothered to vote on any of the lists and I have like 300 coins with four of the shop items