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I never liked the online as the is a given...its like duh
But it works.
I could see an end user paying 1k to 2k for it.
You will definately get a few $500 offers.
A guy who bought a domain for $150,000 said he had one test. If he woke up the next day and could remember the name it was a buy.
I think yours is right with the plural rings. It can only go up in value so I say develop it or hold it for 5 or 8 years.