You can use it to exchange large values without traditional middleman.
Saying that BTC is just a hash, a virtual nothing and it has no intrinsic value is silly. Its not a tulip bulb.
Talking about pretty things, how come nobody gets railed up when a painting gets sold for millions and its a single color modernistic piece? Its literally just a hearsay that it has any value and no function apart from being expensive firestarter.
Bitcoin costs money to mine like it take money to mine gold. So there is 'work' involved creating it. It has built in mechanism for fighing inflation (finite source), and security for exchanging it. Try to liquidate 100k of gold.
Also its funny to me how people claim btc has no real value when over 20% of USD were printed last year. Out of thin air. Its all about confidence of people using it. If people were confident tulip bulbs have value of 100m per one we would be trading them to this day no matter how usless they are.