[douglas]

Oh, I know he's been known to make quite a number of embarassing mixups, but what he writes for WotC does have the backing of at least quasi-officialdom.

Regardless, I don't see any possible interpretation of the rules in the SRD that would make having a market value over 200k trigger the *10 multiplier. The epic *10 is specifically keyed to bonuses that non-epic items can't give, and it's trivially easy to stack up legal non-epic bonuses on a single item to the point where its total cost exceeds 200k. +6 to all ability scores would do it just fine (Note: Do not ever allow material from the Miniatures Handbook into a normal campaign without carefully looking it over first. The Miniatures Handbook is home to such brokenness as the Belt of Magnificence +6, +6 to all ability scores on one item, for a mere 200k, among many many other things). Now, I wouldn't argue against a house rule that a +20 permanent insight bonus is beyond non-epic limits, but insight bonuses aren't even mentioned anywhere in the RAW as having a cap, non-epic or otherwise.