Yeah, I hope there's a gradient between scalper buying a single 99 cent game and actual person who has time played on multiple games and multiple purchases. The probability of someone with say a 3000 hours played across multiple games with hundreds or thousands of dollars of purchases is far less likely to be a scalper than someone with a single purchase many years ago and maybe some completely f2p play in say dota/cs, since the latter is likely to be a bot account.