The rate of a $100 Play Store gift card can vary depending on several factors. One of the main determinants is the market demand and supply dynamics. If there is a high demand for these gift cards, perhaps due to the popularity of various apps and services available on the Play Store, the rate might be closer to or even slightly above the face value.

However, in some cases, especially when there are fluctuations in the economic situation or changes in consumer behavior, the rate could be different. For instance, during certain promotional periods or when there are alternative ways to obtain similar benefits, the rate of the $100 Play Store gift card might be discounted. This could be to encourage more people to purchase it or to attract new customers to the Play Store ecosystem.

Moreover, the rate can also be influenced by external factors such as exchange rates if the gift card is being traded in an international context. Different regions may have different rates for the $100 Play Store gift card based on their local economic conditions and the value they place on digital store credit. It's important for consumers to stay informed about these rates to ensure they are getting a fair deal when buying or trading such gift cards.