The Player Owned House Entrance Fee Scam is a scam where a scammer charges another player money to go into their house, while most likely claiming that they hav a high level of Construction. The house is either overpriced, or not as good as it was claimed to be. They may also simply lock the portal to their house, so the player can't get in even after paying. The best thing to do is simply ignore people who charge to go into their house, or check their Construction level on the Hiscores.