Allowing $100/day for everything (hotels, camping, food, etc.), based on your schedule, a 60 day trip will cost you $6000.
Do you actually ever spend that much per day on a multi-week or multi-month tour?
The two of us have spent more than that in a day on a 10-day trip. Because the only camping option in Butte sucked, we stayed in the motor lodge portion of the Hotel Finlen for around $55 or so including tax. We had eaten breakfast out that morning and bought sandwiches and snacks to take with us since there were no services between our starting point (Twin Bridges) and Butte and an a mountain pass to cross. Easily $25+. After checking in, I had to try the infamous double pork chop sandwich from Pork Chop Johns. Dinner and drinks here easily set us back probably $75 with tip:http://casagrandassteakhouse.webs.com/
And after dinner we had a few glasses of wine while talking with locals at the hotel bar.
While we don't go our of our way to spend as much as we can, if we feel like it we will take advantage of more pricier options when available. After all, it's a vacation.