Hi Joto,
could you add a yellow note to Payday 2 market pages (similar to hidden region lock note like you did for Rise of Nations gifts, etc) that it's just the regular Payday 2 version and not the Ultimate edition?
These market pages would need the note added: https://dispenser.tf/market/26193/, https://dispenser.tf/market/2822/, https://dispenser.tf/market/14062/
Source: http://steamcommunity.com/app/218620/tradingforum/2592234299529719694/