"because you offered a referral bonus. I am neither equipped, nor have the time, to do pre-interviews. Since you offer upside, and no downside, it is my interest to refer as many people as possible. I only have to be right once to score. You make the rules, I just play the game."
:)
However the most I've seen was a new grad. He's a lovely bloke, was head of all the societies at uni, knew everyone studying CS at a very good uni. In his first year he referred all his uni friends, think he got around 15 or so successful referrals in that first year. My friend in HR processing then said it was more than her salary.
It helps that it is a good company where you'd tell little to join even with no referral, but the incentive makes you seem it that little bit more
my last 2 articles: - https://news.ycombinator.com/item?id=37753292 - https://news.ycombinator.com/item?id=36634529
If I enjoy working at the company, then I will do that regardless (assuming I know a qualified dev who's looking for work, which is pretty rare), and if I don't enjoy working at the company, then I won't.
If you're able to consistently source great candidates, you might want to lead a team instead where you'll be better evaluated / rewarded on that though ;)
source: https://events.afs.com/referral-bonus-program#:~:text=For%20....
Love it.