Bitcoin is not expensive at all, it is just getting more valuable day by day. If we are talking about price in fiat currency then,
1 Bitcoin is equal to 1,675 Latvian Lats and the same Bitcoin is worth 13,81,57,865 Vietnamese Dong so it doesn't actually mean that it is cheap in Latvia and expensive in Vietnam.
Bitcoin was nothing a few years ago but more and more people joined the rally over the years and demanded Bitcoin,
10) Last but not least, who the hell is stupid enough to pay $5.00 now for a bitcoin?
Now Bitcoin is growing with a rapid growth rate and if demand continuous then the price will keep rising as per the law of demand and supply.