Hey guys,

In order to benefit, will I have to cash out bitcoin when it gets high? That would mean i would have to sell it for dollar or other currency.
When i am buying online with coin, if it says the shirt is for $25, will they calculate how much $25 is worth in BTC at the current market rate or
how much it originally started with? If its at the current market rate, then whats the point of bitcoin if i am not profitting?