It seems like you might be referring to a variation of a game or bet related to a Christmas gift exchange, often called a “White Elephant” or “Yankee Swap.” However, “A Christmas Gift Bet Plus” is not a standard or widely recognized name for a game. If you’re describing a specific game or bet with rules that have been modified or added to, I’ll need more details to give you an accurate description or explanation.

If you’re looking for ideas on how to create a Christmas gift bet or game with additional rules or a twist, here are a few ideas you could consider adding to a traditional gift exchange game:

1. **Themed Gifts**: Specify a theme for the gifts, such as “useful kitchen gadgets,” “books by a certain author,” or “items that start with the same letter.”

2. **Price Limit Bet**: Set a maximum or minimum price limit for the gifts, and participants have to guess which gifts are above or below a certain threshold.

3. **Steal and Keep**: Instead of simply stealing a gift, a player can choose to keep their current gift and add the stolen one to their collection, but with limitations on how many times a gift can be stolen.

4. **Gift Wrapping Challenge**: Gifts must be wrapped in a certain style or with a specific theme, and there could be a penalty or a bonus for the most creative wrapping.

5. **Secret Santa Plus**: Combine the elements of Secret Santa with the gift exchange. Each person draws a name to whom they will give a gift, but there’s an additional rule, such as the gift must be an experience rather than a physical item.

6. **Gift Upgrade**: Each player starts with a small, inexpensive gift, but throughout the game, they have the opportunity to upgrade their gift by trading with others based on certain criteria or challenges.

7. **Time Capsule Gift**: Each participant brings a gift that is meant to be opened in the future (e.g., one year later). The gift exchange is still conducted as usual, but the gifts aren’t opened until the agreed-upon future date.

If you have specific rules or a particular version of “A Christmas Gift Bet Plus” in mind, please provide more details, and I can tailor the response to fit that description.