Usefulness of marriage is arguably very limited, and most of the time, more subject to player's fancy and some very specific setup (namely, "big eaters").
Past this point, there is no real reason to buy multiple rings even if you have 10+ ships stuck in lvl99.
With these 700 yen per ring, you could simply add 300 for 10 additional ship space, which is going to be useful sooner or later.
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