I can not say for the case of the violin being "cheap" but quite a few famous players did announce on the concert/recital posters that they are playing on a modern / contemporary violin. Often this was for violins made by Paul Kaul - very popular before WW2, it seems. I also remember a sort of mini-campaign probably, advertising a Romanian maker - Stirbulescou, now practically unknown. Kreisler, Enesco and Jacques Thibaut mentioned they will be using a violin by this maker in the recital. One of my colleagues in the Romanian Radio Orch played a Stirbulescou violin. It had an indifferent tone, usable nonetheless, though nothing special. What was special and impressed everybody was how easier it was to play, how responsive it was. I have never seen anything even close to that.