Weather is the answer.
Climate is weather in a big area in a long period of time.

Pushpalal (Mid-Hill) Highway (H18) (Nepali: पुष्पलाल (मध्य-पहाडी) लोकमार्ग (रा.१८)) is an ongoing road project in Nepal, which is thought to be 1,776 kilometres (1,104 mi) long. After completion, it will be the longest national highway of Nepal. Nepal has three geographical regions from east to west, plain land or Terai in south, higher mountains or Himalayas in north and hills in middle region. The highway runs through the mid-hills region only. It starts from easternmost hill at Chiyabhanjyang of Panchthar District (Province No. 1) and ends at westernmost hill at Jhulaghat of Baitadi District in far west (Sudurpashchim Pradesh)
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Reasons are supported by evidence
If you've ever been to Sanibel Island, you'd see this in action. Sanibel is known for its seashells, and the beach is covered in brightly colored, large shells. People are walking along the beach collecting them. Everyone gets into a seashell collecting state of mind. As a result, there are tons of shops selling seashells, too, and people are buying them. The ones you can get on the beach are nice but the shops have the nicest ones, like giant conch shells, etc.
So even near the beaches with some of the most plentiful and nice shells, there are shell shops -- in fact, the higher quality of the shells on Sanibel's beaches seems to have directly led to many more shell shops than you'd find at other beaches with fewer shells.