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Airtight definitely offers a better variety of items, but it would be nice if it weren't all random, and if the outfitter exchange tokens could be sold/traded. Definitely better than before by a mile, though.
IP registration doesn't work for many, many reasons. That's one of the least reliable and most easily exploitable means of securing accounts. Requiring two-step authentication would be a great start, and there are other measures, but if you think IPs are the way to go then you've really never looked into the measures that botters and such will go to.
Not to mention players who log from multiple locations. They already have to wait time before they conduct trades via mail; not being able to use accounts from anywhere other than one site would be a pain in the butt.