I guess my wording was a little off. I was more referring to the people that invested their entire life savings in Pyrite Ore rather than the act of stocking up things that will actually be high in demand.
I was using Maelstrom Crystals as an example because if you didn't already start stockpiling them before the Maelstrom Shatter was officially announced, you're very likely to not make much profit, break even, or even lose a little bit. That's because their prices doubled within seconds of the announcement, any Maelstroms you purchase now are not worth stockpiling in the context that any of your competing goblins worth their salt will have double your profit margins for any enchant involving Heavenly Shards or Maelstrom Crystals come patch day.
I don't think one could even be considered a "goblin" if they couldn't even enchant/gem their own items on patch day and have to buy some overpriced crap on the AH :P
And taking a word of advice from @Meyer : I have to agree, make sure you prospect/DE/craft all your stuff BEFORE patch day. The last thing you want to do is have to lose an hour of sales re-cutting all those gems because they sold in 5 minutes.
At this point, depending on how much storage space you have available (or are willing to deal with, in the case of mailbox zealots), it might be best to leave some of your purchase thresholds untouched for ores and enhancement mats, even though prices are dropping. For example, all four volatiles seem to be dropping like rocks and I don't think you could go wrong with having a stock of them.
