Rack rate for a standard room at the YC this year for marathon weekend was $325/night.
I have stayed at the Swan before and after all fees and stuff, it ends up costing about the same as YC/BC unless they are running a special (which I doubt they will for that particular weekend.)
And, a 10k is not bad at all. I ran 10k this year and had never run that far all at once prior to the race. I drank up an energy drink, had a banana and a power bar an hour before the race and I FLEW through the course. I won't lie and say I wasn't in agony for the following 24 hours, but during the race I felt great. The adrenaline really gets you going and the course honestly feels shorter than I thought it would. Tons of fun!!