Those happened because the project you invested was trash.
Good projects see a price increase or a price stability on their Initial price at least.
If the project is good and there is a development on going on the background the price is going to increase for sure.
Your words are theoretically correct, and this is what made me participate in the projects at the beginning, but in practical terms, I believe that the reality is not that, during my long follow-up to new projects, I did not see any good project !!
Can you give me an example of a good project for two years now?