There's little incentive for commercial entities (or entrepreneurs) to go after non-.com domains. If they get a non-.com they'll eventually have to upgrade to the .com anyway, and it will be pricier then.
As far as your .net domains, I don't see any value in them. Sorry.
Fitil.net & Tarak.net = $5 to $20 ea. = Reseller Value Speculation (NOT an end user speculation)
The rest = $0 to $10 ea. = Reseller Value Speculation (NOT an end user speculation)