Tablet owners spend big bucks online according to a new report. In fact, the new study published by Adobe Digital Marketing Insights suggests that tablet owners spend 50% more per purchase than smartphone owners on retail purchases, and over 20% more than PC users. The study found that smartphone owners spent about $80 per purchase on average but tablet owners spent an average of $123. Laptop/PC users spent $102 per retail purchase on average in 2011. Tablet owners are three times more likely to make a purchase on a retail website than a smartphone user is, too. Adobe Digital Marketing Insights gathered its data from more than 150 U.S. retailers last year and more than 16.2 billion transactions made online.