Aren't there ways to make money (mining, etc) without being exposed to fiat?
Well, let's check that.
Using info from
https://en.bitcoin.it/wiki/Mining_hardware_comparison. Let's assume price of BTC is $10.50
For GPU mining, best card is AMD 5850. Lowest cost is $145 (Google shopping search). Hash/s 283. Wattage 92.25. Cost of electricity, 0.13 USD/KWh. Plug that into
http://bitcoinx.com/profit/index.php and you get $27.46 USD profit in the first month. Divide by 4, that's $6.87 per week, or 4.7% profit a week. Sounds good, unless you include GPU depreciation, or extra cost of hardware.
Let's say the card you bought for $145 can only be resold for $120 after a month. Now your profit is $27.46 - ($145 - $120) = $2.46 a month, or $0.62 / 0.4% a week.
Or let's say there is no depreciation, but you ran out of PCI express ports, and need to buy another PC to stick your new GPU into. Let's be VERY conservative and say a new PSU, MoBo, RAM, and CPU will cost you $150. Now your profit is $6.87 / ($145 + $150) = 2.3% per week.
Combine extra hardware with depreciation (and having a crappy, hard to resell PC), and you're even worse off. Since the large purchases are one-time costs, over a longer period of time they will pay off, of course. E.g. $2.46 / $145 = 1.7% profit per month. But also keep in mind that these components continue to depreciate, and even more importantly, the initial investment is now tied in hardware that may be difficult and time consuming to sell. This is why I think mining is OK for individuals (long time horizon, pay off GPUs over a few months, still have something to play games on), and is too risky to invest in. I definitely would not consider mining investments as something that can pay 2% to 3% a week though.