It's an egg/chicken situation. If people find out about a stadium being built, they will artificially increase the price of their land (as they are entitled to), but without land there will be no stadium. The stadium also needs to be build in a place which is accessible, so remote places are out of the question. It is indeed a very complicated situation. Ideally, they should do a viability study, calculate IRR/NPV etc. to make sure that the project is even feasible and maybe invite people to invest by issuing shares. Then buy a big chunk of land at a market price. If it just done for sake of glorifying Gautam Buddha, it will end badly. In today's world commercial success is really important for any project to be sustainable especially a project this big.