So, I was browsing my invite friends section and then noticed a different offer.
It was typically $50-55 AUD credit nowadays but my referral sections says it provides 15% off for new user's home bookings (max discount $570) + $21 experience credit (for $73 or more).
If I got the calculation right, you get better prices using this referral promo when your booking total is over $367. Max disc. capped when booking is over $3800 (for those who travels in longer period).
I'm aware that posting referral links violates the rules here and this post only serves as a reminder.
Mod please delete this if found inappropriate.
Proof:
Screenshot
With your $3800 calculation for max booking. I would say there is no limit.
$570 > $50-$55 so even over $3800 booking still go with the 15%.