I wouldn't be surprised if the FUN price in BTC equivalent dropped to 1 sat or even lower soon. And I wonder how freebitcoin will display the price in the buy/sell section in that case. If the situation with the spread will not change, then in this case, you could buy a FUN token for 1 sat, but selling it would only give you 0 sat, ~
I believe it won't be like that. There is an easy solution of this. They will allow the users to buy 1 FUN tokens for 1 satoshi. And users will be able to sell at least 2 FUN tokens for 1 satoshi, 3 FUN tokens for 2 satoshi, etc. The system won't allow the users to buy and sell 1 FUN tokens if it's price goes below to 1 satoshi. Users have to buy/sell more than 1 FUN tokens to adjust the price in satoshi. Adding one more decimal point for the BTC could be an alternative solution, but it won't be perfect there.
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..
But then, speaking of the price of fun token going down to 1 sat, I don't think this will happen, at least, not now we are beginning to see some changes in the services provided by freebitco, except things have changed again which I am yet to take notice of..
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, or the price becomes capped at 1 sat, that is, those buying will have to buy at 1 Sat while those selling will have to also do so in the same 1 sat.