The Purge: #4682 Lords of Vegas: Underworld - Promo Cards: Do you need this?

About Lords of Vegas: Underworld – Promo Cards, from BoardGameGeek:

A set of 3 promo cards given out with each copy of Lords of Vegas: Underworld backed on the Lords of Vegas 10th Anniversary Kickstarter. The cards include: The Big Score - When your casino pays, you may gain an additional $1M per tile of the casino, then discard this card. Time Share - When building a casino tile, you may use the blank 10th tile of that color as your tile if it is available. Binding Contract - The final wording of this card is not yet complete, but will have something to do with a promise of future actions. This card will reference the Lone Shark Games Apocrypha Adventure Card Game as that game had a card that referenced Lords of Vegas.