Time, energy, and effort.
You have to read all of those first and analyze everything specially the profits that you will have for mining it.
Yet, they just dumped it like its nothing.
Top 100, pick one.
There should be one there with low difficulty to mine.
Their are many things that goes on stake like mentioned, its not just money but various other things like time which is the most precious because once it goes away then you would not get it back rest of the things can still be pursued in future. Efforts and energy also is the right thing which gets wasted. Learning from the mistake and not repeating it in future will make be help the person to grow as well.