Sadly enough, some Steam users have found a dishonest way to abuse the Humble Indie Bundle 4 to increase their chances of winning Valve's current raffle promotion.
Aiming to increase their raffle "tickets," the scammers bought hundreds of copies of the bundle for a penny each. The scammer would then use the Steam codes that come along with the bundle copies tp legitimize hundreds of Steam accounts that are then used to enter the raffle.
"This is unfair to legitimate entrants and is definitely not what we wanted to encourage with Humble Indie Bundle 4," the humble indie bundle 4 organizers wrote on their blog. "It's a lose-lose situation for the indie developers, charities, Valve, and Humble Bundle."
To combat this scam, Steam codes won't be included with copies sold for less than a dollar each.