ORIGINAL: TANKDUEL
The MORE Tamiyas you have acts as a phallic symbol to other Tamiya owners with less tanks than you.(I have 7 HAHA)
The more you spend on upgrades enhances phallic symbolism to other tankers.
You can spend loads of cash on upgrades without the wife noticing you have more stuff.
But the real question is..... why? Shouldn't you be doing something more productive with all that money my friend?