OK, so I'll fill up the 52 page passport in about 3.5 years from issue (Despite living in SG, so not getting stamped there, OZ, US, or a couple of others through Global Entry and it's reciprocity). Why not just get a new 52 page one? There is something kind of cool about having the fattest, but I don't want to deal with it, and frankly mine looks like it's been through the washing machine about 20 times (though it hasn't) in only 2.7 years.

I assume that most people in this boat travel for work, so getting the new passport should be expensable, and especially since page per page it's cheaper, why not?!?