Do we even have such a high craze in companies within India that would be willing to spend that money on sending bankers to such an event ? I would imagine only the international companies would be interested, and that too not within India.
There is a huge buzz amongst Indian banks regarding blockchains. There have been multiple articles posted here and ever since Raghuram Rajan and AP Hota, who intelligent people who are/were at deciding positions, have understood that the technology is disruptive, banks have understood their seriousness and have taken on many ventures. There have been atleast 3 national events(hackathons, conferences etc.) by NPCI this year related to blockchains, which were attended by banking heads from major Indian banks.
Apart from that, the buzzword-laden market has also done its job. BlockchainU has been holding certifications for major Indian ITs like Infosys, Wipro, and have trained people at BSE, and have been falsely pushing Ethereum as a smart contract platform, while technically anything you can do in ethereum you can do with bitcoin. These are the workforce that vendors the banking industry so have a lot of influence over their decisions. Thus a lot of banks are looking at ethereum based solutions and there is a lot of craze for it.
This fees is nothing for banks.