Yes, you are right.
Stockpiling for the heck of stockpiling. Joy of buying, especially buying not really needed things.
As I see it, the single important thing is nicotine. It is definitely will be at best heavily taxed, at worst it will be not accessible at all at higher concentrations (say, above 12 mg). Mods and tanks may survive. I am cautiously optimistic. Media direction is slowly turning in right direction. Law suits, etc. Mods amd tanks may be heavily taxed also, but I rather buy a new mod in 2-5 years (for a double price) than stockpile mods that will became outdated really soon. China will not stop to develop new things.
So, my stockpiling, after excluding nicotine, cost me about $100 (or less). Couple mods that I do not really need today, couple tanks, some spare parts. OK, we'll see...