From speaking to (2) bar managers in the trade, they'd be quite happy to push the stout on customers. That's not a problem. One of them used to stock O'Hara's and did a lot of promotion off his own bat, including giving free pints out to punters who asked for Guinness.
It's pushing it on existing stout drinkers and then telling them that it costs more. This is despite the fact that they already have absolutely no incentive to move.
Pricing lower that a macro. I couldn't disagree more. A micro's first and only real weapon is keener pricing when products are perceived to be directly, perfectly, in competition. The customer can quantify price, everything else is subjective.