I put my spend on various cards depending on what I'm spending on to get the most out points/miles out of them. I probably spend a little less than $70K a year but have put my spending on the following cards: Chase Marriott Premier, Chase Freedom, Chase Sapphire Preferred, AMEX Gold, AMEX HHonors, Citi Forward & DiscoverIt. I know others have focused spending on one single card to hit a high spending limit for an extra ton of points/miles.