There are currently scrypt asics that are readily available and are much more efficient overall than using another GPU only algo. This also frees up all GPUs to be used for BOINC scientific research with is the main goal of Gridcoin.
Just a matter of time to port X11 to ASICS....
anyway: no need nor a market for Gridcoin... get real: it's listed at position 156:
https://coinmarketcap.com/all.html
Darkcoin (question from the other guy) at the other hand plays in a completely deferent league. That's X11, has a huge market, and has a very creative dev-team..... but it's a bit "too dark" for me (aggressive anarchists).