The total budget at this point is $235 + $170 + $80, which equals $485 over 6 days, or roughly $80 a day for one of the world’s more expensive solo backpacker locations, hitting most of Oman’s highlights, doing stuff a little more like locals that tourists, and immersing oneself in some of the most beautiful nature on the planet.
Note: I’ve not included food in this budget, since one has to eat anywhere. I’m confident based on checking sites like wikitravel by using markets and street snacks mostly, with minimal meals out, that I can easily keep food budget under $20 a day if not less.
Hope this was a not too crazy foray into how I can actually afford to do stuff like this, and gives you some ideas!
The World Wide Webster - offbeat budget travel 
You’ve really put a lot of thought and consideration into your budget. As a frugal travel myself, I’m constantly trying to plan and anticipate my costs for each country. Do you find you tend to be over or under more often with your estimates?
I usually tend to be pretty much on. In Oman I actually was under. On this current trip (South Africa/Southeast Asia) I ran into a couple unexpected expenses in South Africa. I wasn’t too worried since SEA is so cheap but I had to really manage my expenses (down to the last baht, not even joking here!).
Because of my research I knew how much things should cost here and where deals were to be had. So I ate well (30-40 baht street food), still got to do everything (massage course, couple massages for myself, trekking with homestay, rode elephants, hot springs, boat ride down the Mekong) but I just had to be really really frugal. I’m broke again…well, until I cash my refund check in a couple days heh heh.