I think the more likely scenario is one like the recent implementation of TPD regs in the UK, where there's a grace period and the suppliers are trying to sell enough stock to DIYers that prices don't rise much. Remember that we make up a small percentage of the market, but pay quite a lot per unit because we buy in relatively small quantities at relatively high prices. Anyone with a bit of cash in hand in the UK was able to stock up at usual prices right up until the day the regs went into effect.
Underlining was added to show what parts I'm respondng to.
See, I'm not sure many US vendors wouldn't jump at the chance to charge what they could for it, if they utilized the old "supply and demand" pricing structure at that point. Maybe the UK vendors didn't do much of that though.
As far as what we pay here in the US by the Liter - I'm not sure I agree that we pay relatively high prices for it...compared to what
others have to pay in other parts of the world. I recently helped a member in India, source his best deal there for nic base for DIY. It is legal there, and sold by various vendors in India, from 0mg-75mg, and in quantities from 60mL-1L. He only needed enough for about a 6-10 month supply of DIY @ 3mg.
The best deal for him, within the country (to avoid high import taxes and possibly customs confiscating it), was to buy a 60mL bottle of the 75mg/mL nic base. For that 1 bottle his cost without S/H was equivalent to $11.93USD. So, that works out to a whopping
$198.83USD per liter, if bought 60mL at a time! 125mL of the same 75mg was $19.23USD, so that's equivalent to
$153.84USD per liter, if bought 125mL at a time.
It
was available in 500mL and 1L sizes,
but the highest strength available in those quantities was just 18mg. (He didn't need a L, nor have a way to safely store it.) The cost for 1L was equivalent to $46.92USD + S/H...but that was less than 1/4 as strong as the 75mg, so would be more expensive in the longrun.
Compared to that, IMO
we have it at practically bargain basement prices here, especially when it's 100mg/mL and on sale by the liter!
ETA: The least expensive vendor for flavorings over there...charges about $3.15USD for just 10mL of TFA flavorings, too! I felt so sorry for him...having to pay those prices for nic base and flavorings. The PG and VG wasn't cheap either compared to here.