Alan said:
If you offer <50% of what I think it's worth, I'll buy you out - if you
offer >50% of what I think it's worth I'll sell -
If I offer <50% of what I thinks it's worth, I risk you buying me out at
that price - If I offer >50% of what I think it's worth, I'm offering
you the difference between that and what *you* think it's worth IYSWIM.
The party percieved as making the profit then has to find a buyer for
the whole thing.
Not necessarily for the whole thing, perhaps only for the half thing.
Generally only one party wants out, the other does not want to sell
his half and can't afford to buy the other's, so the usual solution is
to find an outside half-buyer, not an outside whole-buyer. Even if a
whole-buyer is then going to be sought, your scheme places both
co-owners in the ridiculous position of having to guess the value
before a buyer is found. Why not just find the buyer first?
This is a major difference between boats and houses. People don't
generally share ownership of a house unless they also share its
occupation. It's not very common for complete strangers to buy a house
together to live in together (even if not as a couple). It's easier to
imagine this happening in the case of a holiday home where the sharing
is done by time rather than space, and this is usually the same basis
on which boats are shared.
Hence when co-owners of a house split up, it generally leads to the
whole house being sold, whereas in the case of boats or holiday homes
it's much more likely that only a fraction of the object is sold, with
one of the original co-owners staying put.