bait and hook model for marketing
you guy buy a ps3 but you have to continue paying $60 a game to enjoy it
from wikipedia
"This involves offering a basic product at a very low cost, often at a loss (the "bait"), then charging compensatory recurring amounts for refills or associated products or services (the "hook"). Examples include: razor (bait) and blades (hook); cell phones (bait) and air time (hook); computer printers (bait) and ink cartridge refills (hook); and cameras (bait) and prints (hook). An interesting variant of this model is Adobe, a software developer that gives away its document reader free of charge but charges several hundred dollars for its document writer."
i also call it courting... you take the girl out but your not supposed to get any goodies until marriage