You need to stop imposing your "condescending" thoughts on others. If PM house is built using tax payers money, so is parliament, president house, GHQ, Supreme court building, Faisal Masjid and list goes on. It is a very "NORMAL" thing in all countries of the world to build dedicated houses for the office of prime minister or president of their country. It is a national asset and I believe it has a constitutional protection, it is just a matter of someone knocking at the door of Supreme court to stop this mad guy (IK) to ruin a national asset of Pakistan.
Also the money is money, you can spend your "own money" also for the betterment of your country, it happens all over the world, your "own money" doesn't mean that you will take it with you in your grave.