Because it is kind of an unwritten law that anything without test is a no no. Although a handful of people will argue that Var alone is doable because it is weak. I would definitely take winny with some test to avoid shut down. The only reason I can see people running winny alone is maybe a few weeks before a show because they do not want to hold the least bit of water from test. (Although a low dose of Prop and an AI would work just fine.) The PCT should include Nolvadex also, imo.