A free table and a cash table are played with the same deck, the same thirteen cards per player, the same meld requirements and the same definition of a valid declaration. The Supreme Court of India described the game as mainly and preponderantly a game of skill because it requires memorising the fall of the cards and considerable skill in holding and discarding. That description applies to every hand a player sits down to, regardless of what sits behind the table.
What changes is the cost of the decisions. A discard on a free table is reversible in the sense that the worst it can cost is a few points. A discard on a cash table is paid for, regardless of whether the hand wins or loses. A drop on a free table is a strategic option with no arithmetic attached. A drop on a cash table is a forfeit of a known portion of the stake, and the size of that forfeit is one of the fixed costs the player is signing up to.
Reading the rules as if the cash surface did not exist is the most common mistake a new player makes. The cards are the same; the decisions are the same in shape; the cost is not. Once that distinction is clear, the rest of the cash surface can be read in the right order: the entry fee, the prize pool, the drop, the wallet and the withdrawal.
What the player is buying
A cash rummy player is buying two things. The first is the right to play for a share of a prize pool formed from the entry fees of every player at the table. The second is exposure to the cost of being wrong, paid in the entry fee, the drop or a bad show. The first is upside; the second is downside, and the rest of this route is about how each is sized.