First, the main purpose of Bitcoin is to safely hide your money from the eye of the governement who overwhelmes you with taxes and halves your income.
Actually you may legally run a business making lots of BTC without declaring it to the governement, because for them you are not getting actual money so you don't have to declare it.
I wouldn't say that everybody has that goal. I have no particular qualm paying tax, and indeed happily paid tax on my mined coins. Worth it if only for the confusion on my tax accountants face when I tried to explain it all.