These are pretty good, because unless you're crazy **** and you change your gaming passwords every other month and none of your passwords for any sites you visit/use are the same, then there is a pretty good chance a hacker could get a hold of it. If this game even turns out to be halfway decent, there will be players foolishly buying in-game currency through these sites, and most often, these gold selling sites are just hacking active players and vendoring their gear and then selling players that gold. A simple extra layer like this will prevent a lot of headache, but isn't entirely foolproof.
I would hope that they would go the way Blizzard did and add an authenticator to iPhones/iPods and a couple other major phone retailers as a courtesy download. Because once you get hacked, you really don't want to wait 2 weeks for your authenticator to arrive.
WoW Blackhand-US-Date of Retirement: 9/21/2010... /Sigh
Devari - 90 Rogue 85 DK Druid/Mage/Warrior 70+
FFXI - Shiva "Retired.... Or not? One more try, honest."
Desmar - 65 Sam 36 Mnk 18 Thf 12 War
FFXIV - Devari Garamond - Sargatanas 50 Paladin / Culinarian / Weaver / Armorer
Beta - Devaria Ariadne - Ultros - Pugilist