Exactly. Right now, because they were the first ones known and so have that...er..."TLD awareness" going, .com / .net / .org are the domain extensions that are going to be more valuable than the same domain with another TLD. You've got to know social and market trends to succeed at any kind of speculation - and even then it's no guarantee. In the future, who knows - some other domain extension could become as or even more popular, though for commercial purposes, .com may be it for quite a while.

I have about 10 I don't use them all and have access to many more :p

hi all
i have 25 domains,but actually using 12 for 4 sites.
for sure 9 are for sale,the rest ill use them if ill have the time.
regards

So which domain are for sale?