It's maybe because the chances of hitting it are extremely small.

0.01% x 0.01% = 0.0001%

I would suggest to change this rule: "Anything less than 0.0001 is not eligible.", and add the following:

Over 0.00001 BTC 0.1%

Over 0.000001 BTC 0.01%

0.01% of 112 BTC is still a pretty good prize, 0.0112, and the possibility of hitting the Jackpot betting with just 100 sats will add fun to the game, imo.