For me, it has slowed a lot. I've been at this for a couple years, and you would laugh if you knew all the things I tried, all the small battery systems I owned, all the awful delivery systems I spent WAY too much money on over time.
I have a great device, and a nice, mechanical backup. I am thinking about a second ProVari, but only because there's something going on with the one I have now. The battery is loose inside the tube (or something) and the thing shuts off sometimes. I know I'm going to have to send it to ProVape eventually and the thought of not having one scares me!
I have stumbled into RBAs, and I've found what I was missing. A great, adjustable, fiddly delivery system. Whether or not I stick to the two I have now is a question for another day. For right now, they're perfect.
I make my own liquids. So whatever flavors I want, I can make. If I don't have what I need on hand, supplies are just a couple days away.
So now, by only replacing wick, wire, batteries, PG, VG, and flavorings, I know I could happily vape on what I have for a long time to come. The need to buy more is not as great as it once was. Yes, it can be tempting..! But I try to look at the things that I buy (non-disposables/non-replaceables) as investments.
It's still a hobby for me though.. Mixing/tasting/perfecting juices, building wicks/coils.. And I know the end of buying isn't here yet. But the need to upgrade is gone, the urge to buy some new shiny toy is gone.
We've all been there. Some of us might still be there! But probably for 90-95% of us, a sweet spot does exist, we just have to find it.