psi,
Capital gains IS adjusted for inflation.
If you bought a product/item in 1980, the capital gains threshold was probably $250.
Now it is $1000.
Rules for capital gains changes from year to year. Remember, you are taxed only on 50% of capital gains so you're not taxed on the whole thing. The number might have changed so don't quote me on 50% (changes). The numbers change all the time. It's the easiest way the government can make changes to the tax system to improve the financial budget while not making a huge impact on the general public.
Not many people make claims on capital gains.
Taxes are taxes.