While a multihull may invert, they tend not to sink, since they are not weighed down by a large chunk of metal and have multiple hulls. In theory, the ultimate position of stability for a multihull is upside down... however a well-designed cruising multihull isn't very likely to capsize unless the person sailing it screws up badly.
Monohulls self-right but also have a disturbing tendency to sink. They have a position of ultimate stability too... upright and sitting on the ocean floor.

And MOBs, the leading cause of death while boating, are far more likely to happen on a boat that is heeled over 30–40˚ than they are on a multihull that is heeled 10˚.
Quote:
Originally Posted by Rockter
Multihulls may not roll much, but they pitch like crazy.
You are warned.
They don't self-right either.
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__________________
Sailingdog
Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Captain Malcolm Reynolds, Serenity (slightly edited)
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