Yes, preferrably spandex. Its popular, and easy to move in.
Yes, they are
Volleyball Net Volleyball Court For clothes: Knee Pads Sometimes special volleyball shorts If you are on a team, volleyball jerseys
It depends if we are talking about Indoor Volleyball or Beach Volleyball. Indoor/ court Volleyball: 6 players each side Beach Volleyball: 2 players per team/ sode
When volleyball was new to everyone there was no certain amount of players allowed on the court
Volleyball shorts are made short and stretchy to improve the mobility of players diving, moving amongst other teammates in close quarters, and in adjusting to the volleyball faster on court. Similarly, spandex shorts provides to the players the security and comfort when they tumble after diving for the ball. They also provide the benefit that the clothing does not touch or get hung up in the netting.
Depending on what your definition of "cheap" is, but Big5 does not sell cheap volleyball shorts. Also, Big5 is very limited for different styles of shorts and not gender friendly. Volleyball shorts only come in men's.
Volleyball shorts come in various colors and sizes. Volleyball shorts can cover toddlers, to plus sized adult without difficulty. Many people play volleyball, and that is why manufacturer need a lot of sizes.