I think with today's prices (general economy for most things), I'd go as high as a dollar per ml. That assumes taxation of some sort and (better) regulated product / more consistent / pre steeped. I somewhat base this on idea that people (includes me) would pay up to $1 for a single smoke, though that of course is under vastly different circumstances.
I don't see things getting to the point I mentioned above, but just trying to to address the OP in as honest way as I can.
See, I'd never pay that for juice or a smoke. For me personally that's a ridiculous level of expenditure. I DIY a lot of juice but I still occasionally buy a few vendor's juices that I really like. However, I also refuse to pay any taxes on juice. Should that scenario occur I'll be 100% DIY from that point on. Right now my bought juices run $11/30ml. That's about as high as I want to go routinely.
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