Why so many (Indians) visit Indian High Commission?

Recently, I had to go to High Commission of India, London, to renew my passport (Yes, it has been ten years I am carrying this blue booklet. I had no idea where I would be after ten years when I got it at first place.). I was thinking it would be like any embassy in India. Lots of local people in the queue to get Visa and I would get priority treatment and the embassy would let me in as soon as I would be there. I had seen hundreds of Indians (local) people queue outside all the embassies in Delhi. However the scene was much different what I had expected but same as I was used to. Lots of Indians in the queue. I was amazed. Why on earth, so many Indians were outside Indian embassy in the chilling morning of London. There was no one to get Indian Visa.

After spending almost half an hours when I could get in the embassy, I saw there were hundreds of like me and there was only one counter for Visa. It was clear that very few people come for the Visa. Rest seven counters were for various services that the Indians required. It was as chaotic as it could be in Passport office in Delhi or Lucknow. There were not enough seats to accommodate the flux of people. If they had printed (on the entry ticket) waiting time then many people would not go inside the embassy to create crowd there. But once you are in then you know that it might take almost one to two hours before your are called.

Apart from everything I also came to know the reason of the crowd. People need four services. After coming here, in a few years, their passport expired (like mine) so they naturally have to go to get new passport. There visit does not stop there. In another couple of years they find that they are eligible for British citizenship so they need to surrender Indian passport to get British (red) passport. Then they realize how much they love India. So they need PIO or OCI cards to say that they have Indian (dual) citizenship. Many of them would rarely say (in public) that they are British except in the legal or other papers where they need to to get benefits or whatever. If you think that the process ends there, you are wrong. By that time they would have kids. Now they would come to get PIO or OCI cards for their kids.

And the process keeps going on and they keep coming every two to three years to crowd and complain "Why Indians cannot work efficiently even in London and make the whole process online?"