Literally, it is quite unusual to spend 200 yuan to buy a watch, two rings and a 2000 yuan gas card. Generally speaking, people may buy more practical goods or services instead of relatively low-value items.
One possible explanation is that this is a sales strategy, the so-called "buy one get one free" or "buy one get one free" strategy. This strategy is often used to sell more goods with lower value to increase sales. However, this strategy is not common in high-end goods such as watches or rings.
Another possibility is that this is a scam. Fraudsters may take advantage of people's psychology of being greedy for cheap, using low-priced and high-value goods as bait to attract people to take the bait. Then fraudsters may not deliver the goods for various reasons, or the delivery value is low.
Of course, the specific situation needs more information to make an accurate judgment. Before you decide to do this kind of transaction, it is recommended that you fully investigate and understand the seller to ensure that it is legal and reliable. At the same time, if possible, it is best to consult professionals before the formal transaction.