I think people are also hoping on the success of the games they bought assets for, just like people did / still do with ICOs. The fact that blockchain could really offer a usecase in gaming and that the gaming sector can be really profitable seems to be enough foundation for a lot of people to build an investments on.
As long as these tokenized items get sold to fund the development and living expenses of the teams this will most likely not change. But if earning tokenized items in games becomes a thing this will definitly change. It is really hard or involves a lot of luck at the moment to earn anything with these blockchain games!