I had more people signing up for the higher tier plans when I a/b tested the plan names. Don't remember what the numbers were exactly but it was interesting to see behavior change because of the plan names.
You might find that further tweaks push more people to the agency tier by creating a "slightly ugly" agency instead of a "slightly ugly" studio -- freelancer.
http://www.ted.com/talks/dan_ariely_asks_are_we_in_control_o...
The people who buy it come from different backgrounds and I don't want to segment the product.
It's a recipe plugin and the premium version adds a nutrition tab to satisfy the nutritionists and category listing pages for people who want to organise their recipes more than what the free version allows.
Any thoughts on a name?