Got alignment done. The gar feels fine, the whine of the rear tires is gone, so seems to be good, but the rear camber was and still is out of spec.
I am not familiar with the format of this new prinout, so not sure how bad it still is. Surprisingly, they did very little to the rear, but it used to whine and not whining anymore. Also, the rears were worn on the inside. So I fully suspected an out of spec toe on the rear, which is not the case according to the prinout.
Is it worth buying a camber kit and going back to have it installed, which is going to ring me more than one tire costs?

 

Out of spec as per Honda. From factory you can not adjust rear camber. There are aftermarket solutions available for cheap

 

Yeah, like I said, there are camber kits for that.
The question is how bad is my leaving it as it is, and what do I risk if I do?

 

Seems like you already know the answer. Like you said above tire wear

 

 

You risk premature tire wear. What do you want to hear?

read the print out it says right on it what is acceptable. Wow

If you care about tire wear, and will keep the car forever, fix the issue. These are things that only you can determine.