Haha, I was sitting with a UF athletics employee at our women's match. Allie Will challenged 2 straight calls and was correct against WSU. The UF employee said that he prefers volleyball because there is a line judge staring down every line to call it with a flag and it takes the player out of the line calls.
I commented that with 6 matches going on in tennis, it would require an additional 30 line judges to call every line where volleyball only has 2. He thought about it and then said, "yea, we are never going to pay 30 officials."