The reason why hotels are added when booking tickets is because many travel packages include transportation and accommodation. This combination sales method can provide a more comprehensive and convenient travel experience. Here are some specific reasons:

  1. Convenience: Consumers can conveniently book a hotel while booking air tickets, without having to deal with accommodation issues separately.
  2. Cost Considerations: Airlines and hotels may offer certain price concessions because they hope to increase overall revenue through bundling.
  3. Promotion: Sometimes this bundle is part of a promotion to entice consumers to buy.

As for refunds that cannot be fully refunded, the reasons may include the following:

  1. Cost loss: Airlines and hotels may pay certain fees in advance when selling packages, such as booking hotel rooms or purchasing air tickets. If customers cancel the tickets, these fees may not be fully recovered.
  2. Policy regulations: Different airlines and hotels have different refund policies, and a certain handling fee or price difference compensation may be charged.
  3. Market supply and demand: If the demand for air tickets or hotels is high and the supply is limited, refunds may require higher fees to balance market supply and demand.

In short, these policies and regulations are designed to ensure that the rights and interests of both businesses and consumers are reasonably protected.