I've been to Paris countless times and while I certainly agree that one doesn't go for the hotel lounges, I didn't know breakfast outside was the reason to go either. Further, I would be willing to bet that Paul (and other places in the Palais de Congres) is (are) more reasonably priced than Laduree (quality may be a different discussion entirely). I'm not familiar with the other places mentioned so I can't speak to their prices.