I don’t think many people (myself included) want to turn this into a huge exercise.
Why because it involves REAL math?
If you want to be all “realistic” why don’t you throw NPV, interest rates, Ebay buyer fees, maintenance costs, and Vlad’s bowling average in there?
Sorry that I am pointing out a HUGE flaw in the original equation that only requires one extra math step to fix. If that’s too much for you then fine. Have fun with your 100% inaccurate result.
As for whether this thread has a point or not, people are responding to it so that’s all I am concerned about.
Good for you.