The irony here of course is that the only way that Crypto currencies would meet any standard definition of an asset would be if they were functioning currencies.
Going with Investopedia's straightforward definition "An asset is a resource with economic value", how is a non-currency crypto coin in any way a resource or possess economic value?
Exchange theory of value says that a commodity has two values: a use value (what it can do for you outside of the market) and an exchange value (what others will give you for it in the market).
I think it'd be correct to say that cryptocurrency has no use value, but it obviously does have economic value. And it's far from the only asset with these characteristics.
Simple. Bitcoin is an asset that is not used as currency but provides the holder with certain desired benefits and the asset can be liquidated if needed. Skepticoin is similar in that it provides a financial vehicle that possesses certain properties. I'm not saying it should be thought of as digital bitcoin but that it's like bitcoin, it provides value not only in its price tag but in some inherent property that provides value to the user.