Only problem with registering large volumes of domains for long term investment is that every 2 years you are having to renew them, so year by year costs escalate. OK if you can sell enough to cover the cost of renewing the others.
Notice Nokta have recently let quite a few generic type names expire, not sure if this was deliberate or they have so many they've missed a couple, would seem odd to let domains expire which may have some value only to register some more obscure type names.
I recently caught flooded.co.uk which I think was previously registered with Nokta, would be decent name for any company involved in manufacturer or supply of flood defence equipment.