Well, I'd change my answer if I could. I should have enough to last me about two years now. I just dumped another $100 on liquids and about the same into more parts. This will leave me with 7 batteries (only two have been used so far and are still fairly new) and 5 brand new attys + 1 in current use, about 500 ml of fluid, 2 chargers, and 1 passthrough. I probably use the passthrough for 40-50% of the time I vape. So the batts should last a while. I probably have a tad over $300 into this (just a guess). If this stuff lasts two or more years, it will be well worth it. Even more so if restrictions or a ban are put in place.
edit: Oh yeah, and I have about 25 carts.