I think Nacho prefers to make himself a solitary sacrifice to his projects. He cannot force others to give up their own time and money for his dream, so he cuts everyone off and hefts the burden alone. That is his way.
He needs more from people, but he cannot demand more. He does not like to be in the position of depending on others for help.
Plus his projects seem to be a personal challenge. If a project fails, he needs to know it was due to his own mistakes. It makes him push himself harder to because the burden of responsibilty lies solely on his shoulders.