Thanks for the comment! I'm in for the long term, so the way I see it I benefit in two ways:
(1) if I help players join (and stay!) then the whole ecosystem wins, and so do I
(2) if I get some players who stay committed for a long time, the gains for me will also compound; it just takes 1 whale to cover my costs :)

In any case, it serves the greater good of the game, which is completely in my best interest.

My referrals get Silver decks btw so they should be competitive until roughly Gold, where I think many decks start to have lots of higher level cards.