Yeah, but you can mine with your ATI graphics card and there are smaller 5 Gh/s miners at $275. Then there are the alternative litecoins that are somewhat profitable and may raise in value (I've learned this yesterday).
Sure.
There are 3 methods that I know: 1) "mining" virtual currencies; 2) rent your idle PC power; 3) run a program that generates traffic to websites
1) To use these currencies, bitcoin, litecoin and others, one downloads a wallet manager and can pay services and receive money using those currencies. It is also possible to trade those bitcoins into $US or € at an exchange, for a fee.
In order to strengthen the security of transactions, it is important that a sequence of calculations consolidates and makes them irreversible or at least exponentially more dificult to reverse. That's where "miners" come in. A miner has tipically at least an ATI graphics card (or dedicated hardware like above) that does those operations very quickly. When the calculation reaches particular low values, the miner gets compensated with a number of bitcoins or litecoins. This is by design to ensure that the currency as a whole lives on.
Since it's so hard to hit those limited values, most miners join "pools" where the combined computing power of lots individuals work in order to get the "free" bitcoins. When the pools does so, the payout is distributed to it's members proportionally to the computing speed.
Here are some links:
Bitcoin:
http://bitcoin.org/en/
https://en.wikipedia.org/wiki/Bitcoin
https://en.bitcoin.it/wiki/Mining_hardware_comparison
Litecoin:
https://litecoin.org/
http://litecoin.info/Mining_Hardware_Comparison
For example, I have an ATI Radeon 7870 and I can mine bitecoin-SHA2 at 480 Mh/s and litecoin-scrypt at 370 Kh/s. If you have an ATI 7970, you can mine at 600+ on either. Using a calculator:
http://www.alloscomp.com/bitcoin/calculator At 480 Mh/s I get $20/month (LOL) if I leave the card 24/7, overclocked and with the voltage regulators at 90ºC. It would be dead in a few months. However with a 5Gh/s Butterfly Labs Japaleno ASIC miner, costing $275, one can currently mine $200 worth of bitcoins / month.
https://www.litecoinpool.org/calc?hashrate=370&difficulty=821.92548534 At 370 Ks/s I get $36/month, however with the GPU underclocked and at lower voltage (litecoin/scrypt is RAM intensive instead)
2) This second method is a combination of concepts from Folding@Home and similar projects, and cloud computing. Some guys are “building” a supercomputer in a distributed fashion by using people's idle power. You register at the website, download a software that manages and encapsulates the work that is to run on the computer, validate your account with an SMS from your phone, set up a payout account, leave the program running and get paid $1/day during a 30 day trial. You later buy “threads” at $50 each that last 1 year from which you get 12 x $30. Now, this is where is start to scream “$50? SCAM!!!”. Where do you need to pay to work??? However, getting the free trial and the $30 is easy. Then with time, I'll see if I can trust the system and reinvest the $30 into a thread.
My affiliate link is:
http://coingeneration.com/auth/new/204092/ . If you register here, they pay me 20% of what you earn. I'll help my affiliates as needed and give them back part of this extra cash, some also to BuF. If you want a direct link:
http://coingeneration.com. Better yet, if BuF admins register, perhaps we could go through those affiliate links and provide direct support for BuF, the admins and their work. It's up to you.
There is a 2nd provider of the same concept that will start soon:
www.ipuservices.com that pays up to $2/day depending on your computer power. They also don't try to change you $50 per “thread” - they pay you, or so they say.
Edit: 3rd
http://www.cpusage.com/partners/
3) If you go to
www.anhits.com, they have there an “autosurf” program. That simulates an user visiting websites, generating traffic. They have a point system, and unless I didn't get it, the payout is ridiculously low. Perhaps there are similar, but better programs elsewhere.