> If I'm signing a contract with you, and you tell me "no one is going to ever offer you a deal like this," even though you fully know many people would offer me a better deal, that's not illegal.

Is it not illegal to get someone to sign a contract based on a known falsehood? I.e. if I offer to sell you my house and tell you that it has no issues, but it turns out termites have eaten half of it and I knew that, is the contract not invalid? I think your solution only works because it's common sense that that is not a statement of fact.