DO IT. JUST DO IT. STOP THINKING AND JUST FUCKING DO IT.
That being said, money IS something you will need. I did a 27,000 mile trip in just over four months back in 2009, and I figure I spent $1500/month. In ideal situations, yes you can do it a lot cheaper, but when you're on the road for long periods of time shit WILL come up. Something will break, you'll lose something critical and need to replace it, bike will need maintenance, etc.
This total cost included gas, a set of tires, a semi-major repair (new crankcase cover, never saw the rock that punch a hole in it), about 20-30 hotel rooms and paid campsites ranging from $9/night to $100/night. I also lost and had to buy a new set of cold weather gloves ($150) and bought a new pair of riding pants ($200).
90% of my meals were cooked super-cheaply on a camp stove (those $0.89 instant pasta packets are great!), I became an expert at stealth camping anywhere, and it helps that my bike was a shaft drive so there were no chain/sprockets to worry about replacing.