The reason why there are no daily cards and only annual cards for sale may be because merchants hope to attract consumers to make long-term investments through the annual card sales model. Here are a few possible reasons:

  1. Cost Control: Annual cards may help merchants spread costs in the long term, including server maintenance, operating costs, etc. Compared with daily cards, annual cards may be more economical.

  2. User stickiness: Annual cards usually come with certain discounts, which help to increase user stickiness and make users more likely to use it for a long time while enjoying the service.

  3. Stable Revenue: By selling annual cards, merchants can expect a stable revenue stream, which helps with corporate financial planning and budgeting.

  4. Promote new users: Annual card sales may also be a marketing strategy to attract new users to try the service. Once satisfied, they may become long-term users.

  5. Avoid frequent transactions: Frequent daily card transactions may bring management inconvenience to merchants, while annual cards can simplify the transaction process.

  6. Service positioning: Some services may be positioned for long-term use, so only annual cards are provided to match their service characteristics.

Of course, the specific reasons need to be judged based on the strategies and goals of the specific merchant.