Q: Why don't photography plan customers get access to Creative Cloud Market?
A: Creative Cloud Market is a new benefit that has been added to certain paid Creative Cloud plans, and is not included in the entitlements for photography plan customers. Some Creative Cloud services, such a Creative Cloud Market, TypeKit, and ProSite are only available to Single App or Complete Creative Cloud plans.
Built into Photoshop CC 2014, the one I get for my $9.99 a month - also called the photography plan are some nice tutorials. When those tutorials go into how to use assets marketplace AND I find I can't use them with the plan I have - I conclude: