ComputerForums .net, .com , .info, ect. have all been developed into highly sucessful sites, and I am sure that many hits will come in from type in traffic, i.e People in India looking for computer forums, in the same way as someone for the UK would type buyaphone.co.uk or something
Undeveloped : $30 or under
Developed with 0-100 users: $50
Developed with over 500 users: $100
Developed with over 1000 users: $300+
Good luck, and I suggest you develop it. You could also make a fortune on advertising if it gets popular. Just try creating a basic phpBB forum on it, and don't advertise, and see how many people join just from typing in the address.