There are a number of reasons that make 'stealthing' a SBD a bad idea; but a prime one is that unless you know how the engineer/FOH person is routing things, you will wind up with nada anyway. At a recent show, the board that I was patched into had some faulty outputs; so I had to connect to a monitor submix out that wasn't being used for the stage...and the engineer had to route the mix to that bus for me.
And as mentioned above, you could also cause technical difficulties for the house, which could make the venue decide to not allow any taping at all, even when the recordists are using mics for taper-friendly acts.