Internet Referral Program Research

I would like to understand the actual effectiveness of paid referral programs on the internet verse no referral program. For example, what if a company that host event gatherings was willing to pay $5 per ticket sold to anyone that referred them? Also any individual would not be limited on how many referrals or payouts for each ticket. The individuals could use face to face marketing, their social media to post ticketing sale links, websites that would be applicable could be posted on as well.

Would a program like this be effective in selling out event gatherings?

Would a program like this be effective in selling out event gatherings quicker?

Assuming if the gatherings would be 3,000 to 20,000 people, how would website traffic be affected?

If the events did sell out quickly, could the event company raise the ticket prices?

Also, how much traffic do you need to attract advertisers?