I think some people would love there to be a scandal. Some because they get their thrills from the thought of scandals, and conspiracies, and then there is the cycling community who is desperate for another sport to come under the spotlight and take the heat off of them.
Tennis is an obvious target, due to the big money involved, and the tennis authorities don't help by not being pro-active enough with their anti-doping policies, but I still think most players are clean. If I genuinely believed a substantial number were doping without getting caught, I couldn't keep watching. I don't really understand people who are convinced they are all at it, who still seem to follow the sport.