5-day parkhopper bought online is $179. That's about $36/day.
So, it now take about 10 visits to "get your money's worth," but only if you can go to DL in five days out of 13 consecutive days. I don't think there is a longer valid time length available anymore. There are discounts with a PAP, so if you plan to spend a lot of money (how much depends on how many days under 10 days you plan to go) buying the PAP might be the way to go for a one-time-long-time tourist.
Costco "Play 4 Days" tickets are expiring 11/18/06. Not parkhoppers, but parkhoppers aren't really necessary, given the choice, and they're $119, or $30/day.
That means that a Premium is now equivalent to 12 days at Disneyland. Assuming that this promotion will be available again, of course.