Among the tokens, only LEO, LIFE and few others have some business model to sustain token's price. For example, LABS project from LEO enabled to buyback 10K LEO at 0.1 Steem. LEO is holding closer to the magic 0.1 Steem. It is evolution and trial & errors, that will procreate better tokens. In fact, PAL dropped on whitelist and most other tokens followed the list.

The most missing part of the token is that who and why will investors buy the token. However, staking tokens can earn more tokens can be a motivation. But if the token's price keeps falling due to selling pressure from the content creators (who are not investors) then investors will avoid the token.

It is happening to the most SE tokens.

The DApp behind the token should have monetizing policy such as Ad, consultancy, burning (e.g. LEO has 9 sinks to burn tokens) to keep the demand up to sustain the price.