yeh, i guess there is a niche industry for buying and selling 2 letter .net domain names... although even if you make $200 from the process, it still is not that much when you take into account all the time you've spent in promoting, negotiating, and transferring the domain name.
So i guess it would be a high volume, relatively low margin business.
Any ideas about the worth of the 2 letter .com.au?
eg
ir.com.au
dl.com.au
af.com.au
ct.com.au