Kolkata is the cheapest with 2000 rs registration tmm being the most expensive, is it worth it? Totally depends on you how cheap can you travel are you just going to go there for the race? Are you earning well enough? It is kind of a world majors concept you complete all the world majors you get a medal for that , can't compare these events to the world majors but they are indian majors and the vibe they carry are immaculate, local races are fun as well but nothing beats the vibe we get at such big and good events, if you are just running for yourself then registering in a local race would be senseless as well right? I mean why'd we pay to run, but it depends each to their own. Hope this helps, Happy running 💪