there is no reward given to any existing Bitcoin holders who in any way brings or introduces anyone into the Bitcoin industry nor this Bitcointalk platform
I'd argue that depends entirely on the intent behind it. There are certainly weaker justifications for convincing others to climb aboard, like speculation and greed. It doesn't help if people are being mislead into thinking Bitcoin is something it isn't, like a get-rich-quick scheme. But there are positive reasons to encourage the use of Bitcoin. Privacy, security, freedom, etc. If that's what people are joining for, then I'd call that a win.
But as for there supposedly being no benefit to bringing in new users, Network Effects should be considered. As a general rule, utility grows with more participants. That's largely true of both the Bitcoin network and the forum. So, provided people are getting involved with healthy motivations, then it's a net gain for Bitcoin.
Plus, purely in regard to the forum, if people are going to get involved in this stuff, I'd say it's better they learn from either here or Bitcoin Stack Exchange. Information from other sources may be less reliable, or prone to not being corrected if false.
