Does it make sense to invest in four letter .nets over .coms anymore? I have one already that I have been holding for 12 years now, but i don't see the value increase like with .coms in .nets even today.
4 letter domains still are valuable, even if they are a .net, have you posted your domain on Godaddy auctions?
I got a 4 letter NET domain too utug.net and some 5 letter COM ones but I see that most people are going for long keyword domains these days, instead of short ones. Short ones are so much easier to remember though... Everytime I have to go to a long domain site, I end up using google and find the site there again. Cannot make a brand around them as well. Short ones, they create a whole new brand.