Older foils and special foil treatments can be worth much more, but modern regular foils are not always significantly more expensive than non-foils
however, there are reportedly tons of boxes in storage
For example, a colorless creature that enters the battlefield under your control with one +1/+1 counter on it won't receive an additional +1/+1 counter
I mean, non-rares like Vampire Sovereign are at least comparable
Securing 30 points will win you 20 Prize Wall Tickets, and assuming you use those 20 tickets on the non-foil Rapunzel - Gifted with Healing promo valued at approximately $150-200, you would be looking to secure, at minimum, another $150-200 for playing well at the event
Whenever the chosen player casts a spell, that player mills a card