My inner greed says:" Yes, YES!", but I think the thing you have here is the best tactics possible. I mean choosing more than 1 copy of (1p) game and hiding an advertising under a spoiler (it makes it a bit a mystery, so ppl are curious what's benteth it. The thing is that not all who click it do the task, bc sometimes they can't at the moment and forget, other time they're just lazy. Putting a hiden giveaway in there could only tell you how many ppl actually uncovered the spoiler.