I don't think penalty is a good idea because it's profitable so infrequently. Often times they run somewhere better or just make seven tricks on strength or we could get a bigger score playing game/partscore. We can't confidently double them at the 1 level with the knowledge that they're going for a big number. It's really a small target that we double and all of the following are true: partner's trumps aren't ragged and he sits for the double with some marginal hands for defending at the one level, they don't have or won't find a better spot, and defending the one level is going to be the best score for our side a large amount of the time. I like a style where responder can bid after a 1m opener with very little strength, and playing penalty doubles here would give him a lot less flexibility. If he has to pull the double, the opponents will know his hand is bad and they will then be able to double us with some significant amount of frequency. I think it's much better to proceed by having a constructive auction - trying to find the best fit and the right level - and not worry too much about penalizing them. RHO heard the auction and even if he didn't care to understand the alert, he still bid with two opponents bidding and a partner passing. He rates to have a pretty decent hand.