For anyone taking notice of such things, buried within the Postal Rate Commission filing by the US Postal Service for their 2012 postage rate increase is this page, which effectively increases the cost for postage and handling charges on orders placed through USA Philatelic from the Stamp Fulfillment Services in Kansas City.
As the fee is currently $1.00 with no limit as to the value of the order. The new rates (effective January 22, 2012) will increase that fee to $1.25 (for orders up to $50 in value) and $1.75 (for orders over $50 in value):

Not exactly unreasonable given today's costs for shipping, but just a little known extra charge that didn't typically make the newspaper headlines when the overall postage rate increases were announced.