is it true that of the 15,000 amazon prime videos only 1,500 are included for free ?

is it true that of the 15,000 amazon prime videos only 1,500 are included for free ?

so shouldnt they say

unlimited streaming of 1,500 titles at no additional cost

instead of

unlimited streaming of thousands of titles at no additional cost

http://www.amazon.co.uk/s/ref=pe_942301_45935801_piv_checkout_email_mo?_encoding=UTF8&rh=n%3A3010085031%2Cn%3A3356010031&sort=popularity-rank