The logo can make it clear that it's not the genuine article in a way that isn't crass (J!zz Bass) or naff (Pretender Bass). When I made a bitsa, I put an "Imprecision Bass" logo on it, late 70s/early 80s lettering. I thought it looked pretty good, and had some thought put into that it works on several levels (the imprecision of it not being a genuine Fender, the imprecision of the ham fisted git bashing the strings... etc.)