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skycoin has a blockchain built in the skyminer router system and pays coins for the data transferred by the skyminer nodes ..so joe public just uses the open skywire wifi network to hook in and the skyminers get paid skycoin for operating the network ...so free internet .... kind of a neat idea a banking monetary and decentralized internet communications system all in one .. So no off switch to the internet anymore !

I see the current (October 4, 2018) market price for Skycoin is $3.61.
Other than sell my SKY for BTC is there another use or market for it?

only use for any crypto at the moment is to sell it for things we want to buy .. or pos mining of some kind ...