Common quote from Robin Jones Gunn, you may or may not have heard about it, but is "You go alone, you go fast, you go with people, you go far".
I love that quote. It's truism. Nothing to take away from it.
Have you met anyone who knows about bitcoins, and then you tried to introduce them to this forum to come join this community, but they refused? I like to see what maybe their reasons where.
Nope, I haven't meant such one. On the contrary, I've meant those who knew next to nothing about Bitcoin and who didn't show any interest in asking penetrating questions about it. I'm not sure anyone who's interested in Bitcoin won't want to be on this forum or on any forum discussing Bitcoin and cryptocurrencies.
...do you have the opinion that lone investors who are not members of any kind of forum or community about bitcoins or cryptocurrency can still be very successful investors?
A tree doesn't make a forest. Everyone needs others to compliment and pull out the best in them. Lone investors may succeed but they will perform better were they in the midst of others. Being in a group with others exposes one to the knowledge others are willing to share. It's cross fertilization of ideas; a symbiosis kind of thing.