I think that upgrades are to avoid getting a whole new system. A 50$ card may just broaden the games or apps i can use. Mind you is probably not much more than what I could sell this system for.
I am not sure that I should be surprised, but this 8 year old IBM is still quite modular -even has a PCMCIA eSATA card, quick removable optical drives for less weight... The dock seemed a waste at first, but each time that I would have to connect and reconnect the USB hub(keyb mouse, BT), VGA, power etc, it would be hassle.