Pretty much the only thing you lose without V4/V4.5 Tamatown is the ability to have all the souvenirs (which have absolutely no use, anyway)
So, if that doesn't kill you, go for it
One could rake in boatloads of cash using Tamatown, but it's hardly noteworthy, considering that the only thing you'd need to save up for would be the UFO, which is kind of useless but somehow 50,000 GP
I guess you couldn't gain the Royal Costume (donate several thousand GP to the King and get three souvenirs from Tamatown to obtain it), but it's kinda boring and only give you a password to some Corner Shop game
you really don't lose much... I'd say they're actually more fun, if you like the jobs you can get (you get paid for showing up everyday depending on how well and how often you do you job, and you get a whole new set of options when it comes to minigames)
(I'm thinking aloud, here)
Edited by Box, 30 November 2013 - 11:48 AM.