Understanding the value of any crypto coin requires some abstract knowledge of what value is. And people here are either 1. not intelligent enough to understand it, or 2. are concern trolling.

Put it this way, if Warren Buffet announced that he was going to start buying $1 billion worth of 90's beanie babies per month, 90's beanie babies would suddenly have alot more value to alot of people.

What is the basis for calculating the profit? USD ?
We use the currency in which it was originally invested. Proceeds from sale and hence fees from profit are easier to calculate and distribute without conversions to some other base currency.