I used nothing but store bought juice since I first began vaping in 2011. Much of it was horrific. In the past year I was able to find some really tasty stuff, but with tax it was usually over $25/30ml. I'd generally grab 3 bottles at a time and walk out of the store $80 poorer, once or twice a week, since dripping eats the juice with vigor. I liked some of those juices so much I never thought I'd be able to recreate them at home, and almost didn't bother trying.
Then I happened upon diy-ejuice.com, who happens to be local to me. Bought just under $80 worth of supplies. A liter of VG, 5 bottles of flavorings I thought would suit me, 100mg/ml nic base, a nikitest kit, and had the wife bring home some syringes from where she works.
After a day of fiddling with percentages I have come up with one juice which I actually like more than the b&m juice which I was trying to recreate. The other flavor I was shooting for still needs some work, but it's vapable, and I'm still on week 1. Nowhere to go but up from here as I refine my mixes.
Aside from the small 10ml test batches I made to get a sense of each individual flavor, I've mixed up four 30ml bottles of tasty juice so far. That's over $100 that I won't be spending at the b&m on juice, and I haven't even put a dent in the supplies that I bought. Even at the small quantities I purchased my diy supplies at, I'm still saving thousands over store bought juice. Win for me, I'd say.
Also, fwiw, starting to diy has helped ease the nasty case of shiny-itis I was suffering from. Now, instead of pining over hardware I don't really need, I'm spending more of my time and thought on refining my flavors. Unintended benefit, I'd say.
If anyone here is on there fence about getting into diy, my suggestion is to go for it asap!