There is no doubt that it costs a bit. However, for me as I take that last gasp of disposable income before I retire now is the time. I can afford it now. With all of my shooting hobbies I am trying to create as much sustainability as possible now. Hopefully when I have more time I will have the resources to enjoy myself. The cost of filling a tank at a dive shop could become something to be cut out. If I already have a compressor it is far more likely to remain.