I bought Supercycle in the 80's. The bikes were cool and the chicks were actually hot. I think their demise was they got into bed with Nostalgia Cycle which was a mail order bike parts company selling parts cheap. By the end, most of the ads in Supercycle were for Nostalgia Cycle and their products.
Nostalgia Cycle produced the SuperVee which was a big V-twin based around Chevy parts. Remember, back in the early 80's the Japanese had not got on board with making v-twin cruisers, and Harleys sucked. Nostalgia Cycle and the SuperVee was an attempt to offer a big V-Twin alternative to Harley. Unfortunately, they sucked worse that Harleys, the Japs invaded, Harley improved, and the SuperVee is barely a footnote in motorcycle history. The chicks remained hot until the end.