I don't know why responsibility to fix this falls on the non-snorer, the one whose sleep is disturbed.
But, by the same token, why does none of the responsibility fall on the non-snorer - who has options (as has been noted in this thread) and has now jumped to the most extreme of those options before trying anything else?
I think there is some responsibility in making sure you have what you need in order to get some sleep. If you know you're a light sleeper and you forgot your earplugs, that's not someone else's fault.
CluelessBride posted at the same time I was, but she makes an excellent point that I thought I'd reiterate:
It's not that the snorer can't be expected to make modifications or sacrifices. It's that a) they can't be expected to make them unless they are alerted to a problem and b) they should be reasonable expectations like buying decongestant, not having to eat ramen for a month to afford the additional several hundred dollars of hotel rooms someone booked without first consulting them.
I don't think (unless I'm missing it) anyone's saying that the snorer doesn't have some responsibility to try to do what they can to alleviate whatever snoring is possible to alleviate. If a decongestant would solve the problem, great. (Understand that I'm saying that they do what they can; it may not be possible to completely eliminate the snoring
- unfortunately, it's really not that simple. I'm sure there are many, upon many, people who wish it were.) But, likewise, the non-snorer has options that he/she can take as well. And those options include some that don't require getting another room before the lesser choices.
And, at the very least, the non-snorer can alert the snorer that they are snoring. A snorer can't do whatever they can do without knowing there's a problem to begin with. An uncomfortable discussion to have with someone? Of course. But, exactly how is "I'm going to overreact and get another room because you've kept me awake for 3 nights even though I haven't told you about it until now and by the way I want you to pay for part of it!" an easier conversation than saying (after the first night), "Hey, Jane. I'm an incredibly light sleeper - in fact, it's a joke in my family that I can wake up at a pin dropping in the next room! I'm not sure if you realize it, but you snore a bit. I was wondering if maybe the air here is a little dry and if you might need to take a decongestant. I know that part of it's my responsibilty, too, so I'm going to try some earplugs"?