Bro, atleast ask the service center via phone before reaching a conclusion, even if it is not worth spending 5k in the end.. Not only does that help you decide but you posting it here could have helped out other forum members also
Anyway from what i see, The total cost of a N7 tablet was around 10k before it went AWOL, repairing the screen should have cost atmost half of the cost i.e. ~5k IMO maybe even less