No, it's Larian's loss. It's not an unreasonable request - we don't all have a lot of time. It's more likely to lose a sale than gain one, no?
The retail copy has a save anywhere feature, thus this "I'm a super busy guy and don't have the time" complaint is a moot point. Larian probably didn't put the option in the demo because they want people to go out and buy it instead of just playing and saving in the demo.
My Favorite RPGs: Divinity franchise, Gothic franchise (including Arcania, so I think I'm alone...), Venetica, Risen, Two Worlds II, The Witcher, Sacred franchise, Fallout franchise, Mass Effect 1, Alpha Protocol, Planescape: Torment, Drakensang, KOTOR 1 & 2, etc.