This is due to relentless cost-cutting by manufacturers supplying sockets to the  large home improvement stores. When you can buy duplex receptacles for less than $1, this is what you get. If you invest in a Hubbell, Eagle, or other reputable brand, the plugs will stay in the sockets.<p>The drawbacks to the American NEMA 5-15 plug are that it is still a shock hazard as the pins aren&#x27;t sheathed with insulating material. Also, the pins get bent easily and are a bit undersized for 15A in my opinion.