Top 3 flavors:
Anything cinnamon candy (like AC, CinnaBomb, Cinny Hots, etc)
Green Apple/Blueberry (I use these interchangeably, more like one good, strongly-flavored fruit flavor)
A strong, full-bodied menthol (something more menthol than tobacco, actually really like this cheap Dekang menthol juice believe it or not.)
I tend to interchange between these throughout the day: one cool thing I've found is that my fruit-flavored juice tastes
better after I've blasted my taste-buds with the AC/CinnaBomb. I like the menthol juice just to switch things up, it kinda cleans my palate in a weird way.
Strengths: I like to keep both 18mg/24mg handy: Like to vape the 24 in the mornings, before bed, or just whenever. The 18 is more for my "stuck-in-front-of-ECF-for-hours" chain vaping. I've only recently bumped up to the 24, as I won't put my PV's down if I stay with the 18. 12 just doesn't never cut the mustard. Do like 0-nic juice for those rare moments when I over-vape and get a headache.
Bottle size: I'm with the others on this one...The 10/15/20ml bottles just don't make sense from either the consumer standpoint (economy) or the manufacturing standpoint (those little bottles are kinda expensive!). I do agree with the idea of 3ml/5ml sample sizes though, especially for (A) new vapers and (B) for people who haven't tried that particular flavor yet and aren't sure if they're ready/willing to commit to a full bottle of something they might not like.
Something I've seen a few vendors do, and really like, is the idea of sample packs...Such as 5 of the 3-5ml bottles for a set price/flavor configuration, or pick your own. Once said person finds their "all-day-vapes", they usually go for the bigger bottles anyways and don't even bother with anything smaller than a 30ml, unless of course there's some crazy clearance deal (and even then, there would have to be one incredible deal for me to spend more money per ml to make me spring for 10/15/20's.). The sample-sized bottles also make great little "on-the-go" bottles: I have a little velvet pouch that I always keep a spare batt and at least two of said bottles full of my ADV flavors. I just refill them from the larger bottles as needed.
Lastly, if I had to pick one thing that keeps me coming back to a juice vendor, it's custom PG/VG ratios. I *love* vapor production, it's almost more important to me than throat hit...I like my juice to be anywhere between 70/30 and 50/50 PG/VG, and the only reason I've not bothered ordering juice from some vendors is simply because they don't offer a custom blend, or the blends they do offer simply aren't to my liking. Generally speaking, I don't care how good a juice tastes if I'm not gonna get the clouds of vapor I crave and the internal satisfaction that comes with that.
If you're going to carry juice, I would suggest mixing it fresh as opposed to stocking a bunch of juice that you might not sell. Certainly there are some crowd favorites that you'd be safe with keeping as staples in the arsenal (like AC, TastyFinger, Halo, Johnson Creek), while other pre-made juice might end up sitting, or worse, on your clearance rack. Lower losses = lower operating costs = less expensive to the consumer = more profit by volume.
