What Is the Economic Incentive for Holding a Payment Token beyond Immediate Use?

The primary economic incentive for holding a volatile payment token beyond immediate use is the expectation of future price appreciation (speculative demand). Additionally, the token may be required for staking to secure the network, which provides a yield.

For utility-specific payment tokens (like gas), holding a reserve is necessary to ensure continuous access to the network's services, which is a non-monetary utility incentive.