Why would any body in their right senses even want to buy just one fun token? What will he or she be using it for..
I have said it just for an example. I know users aren't going to buy or sell 1 FUN tokens only in their Freebitco account. It was only the suggestion which they can use as the minimum exchange value if the FUN token price goes below 1 satoshi.
But let's assume that really, fun token was to dive to 1 sat per fun token, I don't know about the freebitco site, but for exchanges, if the price should continue to go down, they will likely add another decimal point,
Exchanger website doesn't sell FUN tokens for BTC. They allow the users to buy-sell in dollar value. So, they won't have any impact even if the price of FUN goes below 1 satoshi.