How are your parking pages doing? If you’ve noticed your finance parked domains are hitting headwinds lately, you won’t be surprised by new data released today by Efficient Frontier. Efficient Frontier, which manages some of the biggest pay-per-click spending in the industry, is reporting a sharp increase in the amount advertisers are paying for clicks in the retail industry. Finance has declined. The CPC for retail was 56 cents in October, up from just 46 cents in October 2010