Quoted from o-din:Do people really keep track?
My father-in-law could tell you how much he paid for almost anything he bought in his entire life. He had a phenomenal memory. It was always amazing to listen to his accounting of purchases over the years. he had stories about things like his condo in florida that were really fun to listen too because of the detail. If he had been into pinball he could probably from memory have told you what he spend to within a hundred dollars. So just cause some people don't have a clue what they do, doesn't mean others can't come up with great estimates. Most of any estimate revolves around what you wish to include. This is great hobby. It's worth what you can spend.