The thing is so many more people would happily buy the DLC if they weren't beset by these small often easily fixable frustrating issues. Would it really hurt your bottom line that much if some/more time was devoted to it, would it stop the work on DLC/Expansions? This isn't a case of people making unreasonable demands, small development team or not.
There are more engineers working on GalCiv III (And have been for the past year) than there were on GalCiv II.
The problem, imo, is one of attitude. I agree with most of the suggestions I see posted. You articulate the issue in your above statement: "case of people making unreasonable demands". Unless you have some sort of power over me, and I assure you, you don't, don't make demands. It's not constructive.
Moreover, We will never agree with your premise - that GalCiv III 1.0 was somehow something that needed to be "fixed". The more someone tries to insist that we somehow "owe" them these updates the less inclined I am to put resources on a posted idea unless I determine it's something that will benefit most players.
A lot of what ends up getting focused on ends to be from the metrics we get from how people play the game.
For example. the planet wheel thing? If you read the forums, you'd think that it was some core feature. It's not. Almost nobody even presses the govern button. How about multiplayer? Half a percent of the player base has even pressed the multiplayer button on the main menu. But if you read forums, you'd think multiplayer was some widely used feature.
Look, I'm a forum guy myself. That's what got me into the game industry in the first place. But don't kid yourself into thinking that forum posters represent anything beyond a tiny minority and often a pain in my ass.
We will continue to do what we've always done: Make updates to our games based on what we determine will benefit the most people as well as insert features that we think will make our fans happy. Note that neither of those paths involve supporting vocal critics. My view is, if you don't like GalCiv III, find another game.