Definitely saving money here. My sig factors in the Provari I bought. Yes I spent a lot of money on that, but it was an investment and it's one of only two that I own. If I want a different ecig, one of them will have to go for sale in the classifieds. Now that my major hardware purchases are DONE, I don't see a need for buying much more. My RBA has a lifetime supply of wicks and coil for under $20, so although it cost me a lot in the beginning, it will pay off over time. Considering smokes were $9/pack, even buying $50-$100 in juice sometimes a month I come out ahead. And I buy good, but less expensive ejuices, not top shelf.
Like any other hobby that has elements of a habit and even an obsession, you gotta know your budget and stick to it. There are lots of people here who go crazy buying toys and I am sure their break even point is a lot higher.
And think long term. You ARE saving because you're not giving yourself cancer, COPD, emphysema, or increasing your risk of diabetes and heart disease. I have already done the cancer thing. Still paying for it.