Well just say u dont have money etc. But you got like electronic parts that are either broken or no use but there actually useful such as the resistors within it. Well there actually formula and charts on how to read them so it doesnt waste ur time going out and buying them unless u order ur stuff online. But proving a point here that you can use old stuff parts(like me i got resistors from electronical stuff that i dnt use to use for my psp LED and so on).