1- How do you attain the preferred status? I know if you sub for 1 month then go back to F2P you are preferred, but do you also get 'Preferred' if make a single purchase from the cartel market?
2- What are the bonus's for being considered 'Preferred'. Can you make a matrix like you have for Subscriber/F2P accounts?
Preferred Status and what it takes is on the Option Chart page at the very top. http://www.swtor.com/free/features
My question is why is there the ability to purchase a Cargo Hold even on the Cartel Market? If it is free to subscribers AND those that make a single purchase, which you are making a purchase by buying Cartel Coins, thus it would be unlocked.