Well its not necessary to change gasket every time its only changed if it needs change. Well asking the honda guys was just out of curiosity Any good mechanic can do the job in just 300 rs. The problem is that when you buy a car second hand as I did you have to be extremely lucky to have a clean car inside out. Body may be clean, mileage might be low but still there may be problems because you dont know the history and you cant trust that. In your case you have owned the car first hand with total care so the car would not give any problems in your case:). I have experienced this my self when we bought a 0 meter bolan till 40k nothing had to be changed now we bought a 27k driven mehran from a relative and when I opened its radiator due to leaks carrot juice:P came out of it. I have overhauled its suspension have changed the fuel pump due to leak. Both bolan and mehran are from same year.
The point I were trying to make is that when you own a car since its birth you know everything about it as if it were your child and gives very few problems. We second hand buyers are experiencing problems at very low mileage than you and ahmad. Just for reference that "KLINCH" he has experienced an electronics fault in his eps. So I wish that nobody experiences any problems with his car specially when he is with family or on long drive