Leaving a Truly Owned object around can be dangerous. If it takes a tidal wave or an earthquake to bring it to you, when the spell has built up enough potential you'll get
a tidal wave or an earthquake, and all the damage that would cause.
SheZow legend clearly states that "Whoever shall weareth the ring shall forever bear the responsibility of SheZow!"
— Kelly Hamdon
, "SheZow Happens!"
: You ever throw a magic ring in the middle of the ocean and then when you get back for your tea it's sitting on the table looking at you? Granny Weatherwax
: No, Gytha.
And neither have you.