Sure, but you could also have used this dollar to buy oil, gold, stocks, bonds etc
Compare a purchase of any commodity, bond, precious metal, or ETF/mutual fund in 2008 to BTC's performance since 2008. Or 2009, or 2010, or 2011, or 2012, or 2013, or 2014, or 2015, or 2016, or 2017, or 2018...
Sure. Since the invention of say Bitcoin, which of those assets would you have preferred to own and why?