I don't think the current Black Friday event is the solution.I do wonder... does anyone actually do the maths on how hard this thing is to complete when you have a full collection of cards.
Part of the Mathematics problem is the different users have different goals.
A member who owns all (or most) the cards is limited in the winnings which changes every game. If you own all the cards, then the games will not let you win cards (or discounts to cards)
A new user is going to pay more for each card but has the ability to purchase/win/discount more cards.
There are some posts in the forum which have a member explain what was spent for winning a SEC. Since there are random "wins" this will only be examples. "n=1" is not a great sample size.