In my band, we've kind of accepted that we're not going to be 'big' (nice if it happens and all, but...). That said, we still take a professional attitude to gigging - Be practiced, turn up on time, don't mess around in sound checks, wear decent clothing and yes, keep the stage tidy!
There could be a point of view that it doesn't 'matter', but then again, it doesn't take that much more effort to make the stage (or floor, or corner or whatever) presentable. It's just part of the overall entertainment that you're providing the audience!