Same here. I was just talking last night to two friends about blackjack, and they were complaining about the dumb plays that they've seen made by the player at "third base" (the seat that can "take the dealer's bust card and make everybody at the table lose"). First of all, for blackjack, they are ignoring the fact that this player can take the dealer's "hit" card just as easily, and that NO ONE has any way to know, in advance, what card they will take that the dealer would have gotten otherwise.
But more importantly, they are ignoring the fact that bad players increase the return to the casino on ANY game with an element of skill, making it more reasonable for the casino to offer the game with rules or paytables that allow the skillful players to have an edge over the casino!
They understood, but it STILL bothered them -- to which my reply is, if it bothers you that much, it won't change a thing, but go ahead and change to another table. It's still your own play, and how the cards fall, that will determine how you do, not the skill level of the other players at the table (unlike "real" poker, where your skill level relative to the others at the table is an extremely important factor!!).
When I choose to give advice (and most of the time I'm not even paying attention to how the player next to me is playing, but with the originally-described husband-and-wife, there may have been conversation going on to make you glance over), I never act as though I'm an expert at ANYTHING - usually, and usually only if asked "what do you think I should do?", I'll say that "I've read you should..." or "I would..." "..but if you don't want to do that, you do whatever you want, it's more important to get lucky than to make any particular play".
And you know, that's true. We ALL know that it's more important to get lucky than it is to play correctly. Of course, MOST of us on this list ALSO know that you can only control how you play, not whether or not you'll get lucky, so you do what you can... and let the rest of the world do what they want.
With the old "token-in" or "coin-in" machines (before TITO), it was the bad players who filled the hoppers, reducing the frequency with which you needed to get an attendant to fill the hopper 
--BG
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9g. Re: worst vpplayer ever
Posted by: "gmblnmn" nktalbrch@gmail.com buddman415
Date: Fri Jul 17, 2009 5:05 pm ((PDT))When I see a "random" player who has no idea what to hold and makes crazy
choices, I am so grateful and I hope he/she continues in the same style.
That way the casino will make a little more money on those "good" machines
and perhaps they will leave them alone a little longer.