It may appear a bit too specific, but the prices I've calculated are taken straight from the SFC brochure, and then worked according to what I feel will be a good estimate .ie. extra hours etc. But as for the reasoning, I don't have a specific answer. It may be just how I am when planning things? I have been known by my friends to be fairly meticulous and anal when it comes to planning things. It also gives me a visual aid to look at; I can see how much I will actually spend, and compare them to my estimations to see if I'm on target to my budget if that makes sense? I don't have money to throw at the training, so the more I plan the more likely I am to stick to a budget.
In theory.