I use my "20 year" theory.
In 20 years, will it matter? As most things become a distant memory.
I apply it to work, relationships, mishaps, positives, and so on.
For example, a friend was complaining about his cousin & his hairbrained schemes &, pie in the sky, talk. It really bothered him to the point of destroying the relationship.
So, I said, add 20 years, he probably won't be around, and you'll miss him dearly.
Because, some of those, pies, have borne fruit, enterprise, other ideas, projects, & revenues.
Sometimes the investments you have are right in the palm of your hand. They are more valuable than a portfolio of numbers & future consternation.
It is interesting that most people are against the pie in the sky ideas, but when they work - they wish they had bought in at the ground level. It takes special kinds of people to have the ideas, and special kinds of people to back them - however, most of them fail :)
I hope that when my daughter has serious hairbrained ideas, I am willing to support her with them, rather than be completely dismissive, because I don't understand.