I started to mine Ethereum two months ago. Since then the difficulty of mining went through the roof.
If you are thinking about mining Ethereum right now, dont even bother. Even if you manage to get some graphic cards, because they are sold out, it is not worth it.
Two months ago, i bought some GPUs and started to mine Ethereum. the calculator if my mining pool said 4.5 ETH per month. With price over 300$ per ETH and rising, I was thinking hey, my investment to the HW will be back in only two months and than I will make a lot of money! YAY!
Well, after only two months, calculator now says 1.1 ETH per month. Mining difficulty went from 450 to 2200 and keeps getting higher. I managed to mine 5.6 ETH so far, but it is getting less and less lucrative and if you start now, you probably wont be able to earn enough to pay for those GPUs.
Don't get me wrong, even after the electricity fee it still earns some money now, but if the price wont double or something, I advice not to start mining now.
If you believe in ETH as I do, better to buy some now and hold onto it.