The Wats are supported by all. This week when walking past a Wat we pass almost daily in Bangkok, there was a festive atmosphere. A new roof was going on one of the buildings. The roof is made from terracotta tiles. People were giving their support to the new roof by buying a tile (or several) and the tiles were being installed as they were purchased.
After purchasing a tile, you write your name on the back and send it up to the roof with a prayer. In Buddhism gaining merit is how, in the next cycle of life, you come back in a better position. Helping to maintain the Wats is one way of gaining merit.

a woman writes on her purchased tile while a man says a prayer as his tile goes on the roof.

rows of tiles waiting to be purchased

Peter writing on his tile

me pulling the rope to send my tile to the roof in the basket

the basket with my tile being accepted on the roof