2 letter .nets are worth a great deal in my opinion
you have to look at many things like what kind of traffic a name gets and what was it used for before
.NET names are actually very developable when used as "networks"
say Direct deposit "Networks" or what have you
a name like PF.net is worth about 7K - 10K min
while other ones that I owned
DD.net had offers of over 20K
it all depends on the name but if you are looking to buy to sell in a "turn and burn" deal then buying for 10K isn't a good idea
planning on developing - then it's a maybe
but 2 letter .nets are very hot right now
I was happy to own 2 at one point
even for a crappy combination you are looking at an average of 3K +
good luck with it