Why thank you is just a posh british way of saying it.
That is nice but now i feel that agar hum loog I love you ya phir achey words har wakt apne friends ya loved ones ko kahaingey then it will take the novelty factor out of it. The people will get tired of reading or hearing them and the people who say it will say it out of emotion. It will be out of necessity and habit which is bad as well.