In a way, since coins have been primarily distributed via proven verified computation, each token you buy is like owning a bit of historical computation. By buying gridcoin you help offset the electricity costs of people crunching BOINC.
But I agree that a gridcoin:computation market would be interesting, it could be created within a BOINC project, within a Gridcoin Pool or potentially within the reward mechanism (via proof of burn).
By owning Gridcoin, you could vote your project into the Gridcoin whitelist and distribute additional gridcoin to incentivize users crunching your project.
I really like this project. I like altcoin projects with more to them than just being another store of value.