MossRoad, I tend to agree with your assessment with one difference. As you mentioned a used BH appears to be worth around $5k, so instead of calculating the hours based on $7k, should it not be calculated abased on $2k? That changes it quite a bit to 5.5 weekends of rental. I still would not buy the BH for my specific purposes but only the OP knows how it fits in their plan. Lots of ways to look at it.
No because that assumes you are going to sell, can sell it, and an assumed value, to be frank I never heard of anybody buying one used, usually only find them on trades in..