1. It's absolutely not pointless to show that you care about your customer base. It's not about percentage but about things like "Today we gave our current build to our testers and we hope to get positive feedback the next 2 days" maybe followed with "Unfortunetaly we have to take a deeper look at issue XYZ and have to rework the patch, we expect to fix it until the evening" ... this would show the customer that you actually care a lot, it would calm people a bit as they feel the progress and it would take a PR/community manager maybe 1 hour of the day to keep such updates. This would help to gain the trust and respect of the fans and customers and to get a long standing binding to the company. But you know better, I'm sure.
2. It is absoutely realistic to expect to buy a game today aswell as in the past which is at least playable without game stoppers and without obvious bugs of such extent. It is, and other games prove this every day. There are many games which get released in a state in which they are playable from beginning to the end with the vast majority not noticing any major bugs. Don't know which games you buy, but it seems you're here to silence every critic without facts or at least a real constructive discussion. You even tell people how they have to feel. So ask yourself what this lets you look like.
3. Nobody cares how much you invested into the game, the amount of money isn't directly related to the level of frustration. Nor does it make your opinions right if you spent more then backer X or backer Y. It is absolutely ok to be frustrated if you sent some amount of money and don't get what you expect. There are also backers from countries where you earn a lot less money. So your 173US$ might be the same cut for someone else only spending 30US$ and it's not your place to look down to them if this is what you are trying to tell here.
4. "This is the gaming industry" is not an argument, this is pathetic BS. The gaming industry is working on a profit base as every other business also, if it gets away with more money for less efford, then this is the way it TRIES to take. The customers could try to change the rules by complaining, by not buying anymore and in the end there is a chance, if the critical mass is reached, to get a fair bargain on both sides. This is if we don't have to deal with people like you.