You can change just that items font size by doing the following:
1) open eq2ui_inventory_market.xml in Notepad
2) Search for name="row Seller"
3) Change /Fetish.Fonts.FontArial12T to /Fetish.Fonts.FontArial13T or /Fetish.Fonts.FontArial14T
Or if you prefer to bump up everything using that font:
1) Open _FetishStyles.xml in Notepad
2) Search for name="FontArial12T"
3) Change PointSize="11" to 12 or 13
FYI there is a support thread dedicated to FetishNightfall. Posting tech questions there are more likely to be seen by me (the mod's author)
