Yes, I will trust them because legendary members will not do anything to make their reputations dirty so that they will not get red trust their bitcointalk accounts just because of those projects that aren't profitable or scam.
There are numerous legendary accounts, that runs projects even when they have red trust. People still believe them, invest, promote the project.
The other thing is - legendary account can be bought by scammers.
As well as legendary account can have a negative trust and still run successful project. (received red trust long ago for something not connected with particular project).
Red trust is not a sentence, but only trust yourself
