I think your comment was directed at the OP, but with regards to my own situation:
1) I have more than one machine.
2) I don't want my Internet speed to be faster, I want my networking speed to be improved between two (potentially) 802.11n machines. Also, my Internet download speeds are consistently ~30Mbps so I think I *could* see a boost in Internet speed with 802.11n. At least wikipedia suggests that the typical throughput for 802.11g is 19Mbps and 802.11n is 74Mbps.
3) No I don't *need* it. I really only need food, water, air,...