Screw that, just do the first story quest and a few guildleves and you've got the 43k for a tarnished hoplite shield..
And i agree with another poster, shield and phalanx is MAJOR good, so no, you shouldn't.
stop being a lazy bugger and get earning your gil to buy one / craft one!
Ah! But you are assuming that I didn't buy a shield that way already. I have a shield, I just don't think that it's smart to make all new gladiators do this, it's very discouraging!