Another factor to consider is time. How much time spent building and finishing, especially bigger or upscale/scratch built projects. My Level 2 rocket cost me, IIRC , close to $200, plus the motor, another $60. It shredded on it's first attempt, remake entire lower section, another $60. So there's $320, no L2 yet, but I spent probably 40-60 hours working on it (that might be a little high, but you get the point). Then another $60 for a successful L2 attempt. Time, lots of it, that's part of the cost as well.