Bic and other disposable blade manufacturers use the triple bevel method because it is the easiest way to cheaply and quickly produce a good edge with their mass production process, not because it produces the best results. They use three progressively higher grit wheels at progressively higher inclusive angles so that the scratch pattern of the previous grit is removed as quickly as possible. I don't remember how long it takes them to put an edge on but it can't be more than a few seconds. Us straight razor guys don't mind spending hours and lots of money to get the perfect edge, so speed and cost is not the primary concern to us; the best edge is.