Way way more.
If the 120000 cards on the market right now all costed 300 they would make 15*120000=1.8M
Consider that the average card price is probably more like 10k (with crs and stuff to balance out) you have 500*120000= 60M in tax.
Obviously not all of these cards sell but think how many have over like the last 10 years. Kate would easily be worth a few billion. Plus 5 clintz every time someone lends a card.