Entering and exiting the ecosystem to fulfill a trade takes time, and during that time you hold crypto of a certain value
An increase of concurrent trades means the value of the currency goes up if the amount of currency being used for trades remains the same.
A commitment to HODL means a removal of currency from the trading pool.
So by shrinking the trading pool and increasing the trading volume of people entering and exiting the pool in short time frames, the value of the currency increases.
Trying to cash out a large wallet would increase the trading pool and decrease the price.
You may not ever be able to actualize the full potential of what your wallet says.. but you can easily get more out of than you put in without it being a ponzi scheme.
You are providing capital backing for other people to enter and exit the ecosystem, which has value.
When trade volume increases, you can sell some of your wallet to cover the trade volume and keep price stable. If you don't, then the person who entered and exited the market during the increase will get more value out then they put in (less gas and fees)
No one needs to be left holding the bag unless trade volume decreases to 0. And there is no need for trade volume to decrease to 0 if people are aware of the currency and have access to exchanges to be able to quickly enter and exit the ecosystem
