Actually, the Tu-144 was very uncomfortable, loud and constantly vibrated from gate to gate. It was so loud, you couldn't even hear the person beside you speak.
The cost of the short lived supersonic service from Moscow to Astana was only 50 roubles, the same price as the regular subsonic flight.
The main reasons why the Tu-144 was withdrawn from service only months after introduction was that it:
1. Burned too much fuel for the price, making it incompatible with the planned economy
2. Carried too few passengers from Moscow to Astana. The train cost about 10-20 roubles depending on the class, and not many people would be traveling anyway
3. Safety of the aircraft was in question from day one. Since the Tu-144 incident at the Paris Airshow which caused the cancellation of many Concorde orders, the Tu-144 was never reliable and suffered from constant system failures and the planes spent more time being repaired on the ground than they were flying.