Proof? Good Lord, John.
Harold:
Nobody EVER proclaims themselves to be a guru, or an expert on things. (Well, except for you and Loonie.) The usual offender will just proclaim himself such by posting answers and opinions of every topic that comes up. After awhile, they start offering advice on things that they haven't mastered themselves, figuring nobody will ever be the wiser. Never realizing that someone, at some time, will either meet them, be introduced to someone who knows them, or learn of their falsehoods by putting two and two together of the things they post over time.
And hey ... to mollify folks like John and Ken, let me say that proclaiming anyone a BB Guru is the right of the individual poster, and doesn't require any support from others. If you want to believer the guru's, that's surely your right.
You don't see me asking for proof that you are right, do you John?