Well Im not sure about this but iirc the odds to actually hit it would be 0.00499%
The chance to get 10,000 in free roll is 0.005%.
Every time you play free roll, a decimal number which is between 0 and 10,000 is calculated and it's rounded off the nearest whole number. For getting number 10,000, that decimal number must be between 9999.5 and 10,000.
That is actually pretty close to what I wrote but yeah I guess its 0.005%
That actually is almost correct statistically if we assume that the real odds is 0.00499% then that means it would be to hit one every 25,000 rolls
It's expected to hit number 10,000 once in every 20,000 rolls on average.
Holy heck, Im pretty sure I havent drink anything for the evening but how do I even mess this number up lol

. Yeah its 20k rolls
It would be nice if freebitco.in added a special achievement reward for users who reach determined marks on the faucet, such as 10,000 rolls, 15,000 rolls, 20,000 rolls... An extra loyalty prize for long term users who are active on the site for several years already.
Maybe a prize in satoshis, RPs, FUN tokens or even WOF spins.
While we are at this discussion. At this rate, freebitco.in is pretty much like a simple idle game already. They should probably make some sort of freebitco.in idle game for phone but instead of game it could be similar to what we are having on the website + achievement on completing several milestone