“For users with between 100 and 4,999 karma, they will receive $0.90 per 1 gold.”
Gold costs readers $1.99 for one and $49 for 25. Top posters get $1 per gold, so Reddit keeps around 50% of the payment. Payouts are US only and require identity checks through Persona and Stripe. Reddit priced Apollo, Reddit is Fun and Sync out of existence for using its content, and now it pays the people who write that content in pocket change.