What prevents projects (ICOs) from keeping token value?

[Freegan]

In my opinon, it seems that most of those who are investing in this market only do so motivated by the desire to obtain great profits through speculation, without paying too much attention to the true potential of a project to revolutionize the market or to provide an innovative product or necessary service. That's why unfortunately most ICOs tend to quickly lose their value, regardless of whether they are truly valuable projects, as investors always seem willing to exchange their tokens for bitcoins at the first opportunity.