Cool, I could buy it, then sell it and voila! My retirement nest egg is created for a net cost of zero.
The house would sell, just not for the 400 thousand they want for it.
This couple is in their mid fifties, looking after them in their old age could be a VERY long term commitment! Taking care of old people is no barrel of fun for most folks. I think I would pass on this, the house is obviously overpriced or it would sell, so you have to wait for possibly several decades to get money back and only after they are ruled to die of natural causes! What if someone else kills them? This is not nearly the great deal it sounds like at first.