As I said in the other reply, this is wrong. Only the gain is accounted for as income, not the capital. So you basically have two scenarios - you have huge capital and a small gain, in which case you should pay your damn tax. Or you have small capital and a massive gain, in which case you should pay your damn tax.

And remember- this is only paid if you chose to sell that amount in a financial year.

Oh, and afer you pay your tax, phone up all the people you've met that day and explain to them how you've still payed less tax than they pay on their income despite your income literally being unearned.