Keeping in view Pakistan's economic situation, the way PIA works should be admired. Domestic service is also OK. Our economy is at worst stage. What can you expect. This is not Canada or America with abundant money.
Bad economy has nothing to do with maintaining a website or system, bad management results in bad economy.
I could have bought a HKD 8000 ticket from them which i bought from Thai airways you see, only if thier booking system was working.