Yours is right. But cpu mining went out in 2010. Satoshi wanted everyone to mine but pool mining, gpus, fpgas and asics were invented. Usbs will probably lose you money. You should really just buy Bitcoin because you'll make more. The humor was targeted at op.
Humor is fine
As for the usb investment, well, I spent $129 to start.
I have to start somewhere, right?
I have seen conversations referring to banks of USBs adding up to 90+ GH/s,
so I saw it as a way to start in with it all, with opportunity to expand as I go.
I do realize that all of this hardware will be "old" in 6 months.
The hardest part of deciding what to do is that there are plenty of miners with more funds at their disposal,
miners who can buy the top of the line hardware, and then tell us (me, the newbie) that unless I spend $10k or $20k,
I am just pipe dreaming.
The good news is, if I just don't order a drink with lunch for a month, my money is made up
-If I find that BTC mining is hopeless for me, I will investigate other newer currencies with greater chances for success.
Final statement: I'm going to make this work, somehow...