Yup, have to buy it or iLife.
Also, you cannot take an iPhoto library from Snow Leopard or Lion and move it too a Mac running an earlier OS. The data is different for each OS.
"I am a mortal enemy to arbitrary government and unlimited power. I am naturally very jealous for the rights and liberties of my country, and the least encroachment of those invaluable privileges is apt to make my blood boil."
MacPro 8 Core Westmere, pair of 23 inch Cinema and a LogiTech Laser moose