A correction, from user followthechain:
"Golem is not a service provider, it's a marketplace of providers and consumers. Providers on the Golem network set their computation price in GNT, so the absolute price of GNT doesn't matter: if GNT appreciates, providers can charge less GNT (to keep the service at the same USD amount). Very short term volatility is bad for this marketplace, but long term price fluctuations don't matter.
So, investors in GNT could very well have no interest in being providers or consumers of computation themselves. They're speculating on the future utility of the network, predicting a lot of value will be flowing through GNT tokens, which have a fixed supply."