Normal currency, may be printed indefinitely, with no limits. Part of the appeal or perceived appeal (which really, comes down to the same thing) of BTC is that it has a definite limit of supply, and we are already close to 80% of all bitcoin that may ever be brought into circulation. For the same reason (limited supply), BTC is additionally perceived as the ultimate hedge against inflation, immune from governmental manipulation.
In a way, it is like virtual "gold" other than that gold may have some uses (it looks nice, for jewelry, some use in electronics, dentistry), but really - when it comes down to it, gold costs what it costs because it is in limited supply, not for any other reason. Inexplicably, even though there is far less platinum (ALL the platinum that has ever been mined throughout history could fit into a 25 cubic square box), gold has surpassed platinum prices! Which means, that perceived value can mean more than scarcity, which again, brings us back to...bitcoin...perceived value.