Some people toss their brain out the door, when they are told that something worth $350 is theirs for $0. They don't seem to notice the "All we require is....." part of the offer.
"There ain't no such thing as a free lunch!"
Or --
"When the fat man in the shiny suit says, "This is yours, without cost," hold tight to all of your valuables. The price is going to be high!"
Merlin