I'm curious about posts like this as I started out by agreeing with the OP but hadn't thought of this.
I see no reason not to put in an initial offer as low as you want. It doesn't take long, and if the EA knows it's stupidly below the seller's parameters they just won't even pass it on. If they do, then if you have a 5% chance of it being accepted, so what? Maybe you'll get an incredible bargain that will make a huge difference to your life. Probably you won't, but won't have lost anything.
But are you saying here that if I put an offer in at 30% below asking price, when your idea of what's "reasonable" stretches to maybe 10%, you refuse my offer, and then I say "OK then, that didn't work", and I offer 10% below, that you'd then refuse that offer even if it's one that you'd decided you'd normally accept, because my first offer "put you off dealing with me"?
I've never heard of anyone doing that. Would be interested to hear if anyone here actually has done it.
If not, then we're still in the place where the buyer hasn't lost anything. If the ultra-low offer is not deemed "reasonable" then they simply make one that is (if it's worth it to them, of course).