it really depends on your electricity costs, the taxes on getting hardware, and other fixed costs
in long run, depends too how popular btc will get, because bitcoin reward per clock will be halved from time to time(you will get less btc with same computational efford)
in long run, depends too how popular btc will get, because bitcoin reward per clock will be halved from time to time(you will get less btc with same computational efford)
won't matter at all. the increased difficulty will not allow you to ROI on a small time investment any time soon
large investments only allow for re-investing.
If you make $40 per day and 5 days later you make $28 per day, you are going to be looking at a long road for ROI. The difference with large investments is they make enough to add to the overall hash and continue to earn an ~averaged~ same profit at the expense of more power. If they don't reinvest then their overall ROI will take very long too
It's not really profitable unless you invest a helluva lot of money on equipment, so it's generally considered out of reach for newbs. If you want to try mining try out a new altcoin to get a understanding of the whole process.
agreed!
They are using the customer mining rigs to mine the coins. Everyone else is mining at a loss. 
