Like anything, it can be abused. If I type the alphabet over 10,000 times in a post I surely couldnt use the excuse the you shouldnt let me type letters if you are going to police how I use them. That said, I have seen many posts that use the markup text quite effectively, but I wouldnt care if it went away. Though Id personally rather see personal sigs go away. Some people have overly large sigs.
Are you accounting for import taxes, VAT, etc. or just doing a straight comparison from the US price?
It would mean that you wouldnt have your network drop down to the lowest common speed when it connects to the network. You could also use the 5Ghz network if it had 802.11a/n. Apples current solution is the Airport base stations with dual radios so that your PCs can be on 802.11n and your other devices on 802.11g (or 802.11b).