Kindle Owners Spend $443 More On Amazon Than Everyone Else

New research indicates that Kindle owners spend more money on

than those who don't own one of the company's devices. According to

, shoppers who

own a Kindle Fire tablet or Kindle e-reader spend an average of $790 on Amazon per year. Those who own a Kindle Fire tablet or Kindle e-reader spend $1,233 per year on Amazon.com -- a $443 increase over those without a Kindle product. That data came from the Consumer Intelligence Research Partners, which also provided some new sales data to AllThingsD. After surveying 300 Amazon.com customers, Consumer Intelligence Research Partners concluded that 40 percent (20.5 million) of Amazon's customers currently use a Kindle device. Thus far, Amazon has been reluctant to specify how many Kindles are actually sold each year. Instead, the company has chosen to simply announce that every Kindle has sold better than the last without revealing any sales data.

On November 27, 2012, Amazon

on the matter:

On December 4, 2013, the company issued a

:

Without any official sales numbers released by the company, investors are forced to rely on data from Consumer Intelligence Research Partners and other research firms. In August 2012, Amazon did provide one interesting statistic: the company claimed that it commanded

of the U.S. tablet market. Amazon has yet to provide an update indicating where it stands today. Disclosure: