Someday 1 BTC might buy the store. $20 never will.
Shit, so, better put my savings in lottery tickets from now on, for one day they might buy you 20 stores.
/logic
A lottery ticket is a negative EV "investment" by its very definition. Bitcoin is the investment with the largest positive EV on the planet.
And what, other than pure speculation (just like when you buy a lottery ticket), do you base that expectation on? By the few souls who said "BTC will be $100.000 one day"? At this moment there is no reason to expect a positive return on your investment. The long term upward trend that included the 3 bubbles at $32, $266 and $1200 has already been very convincingly breached downwards.