Weather delays Endeavour's return to Florida

The Space Shuttle Endeavour will not return to Florida until Tuesday, December 9, 2008 due to bad weather over Texas. Problem with the shuttle's flight tail cone have already delayed by one day the $1.8 million piggyback transfer atop a modified jumbo jet. Why didn't NASA select to keep Endeavour in orbit one additional day and save the cost of the piggyback ride back to Florida? The weather was fine in Florida the following day after Endeavour landed in California. These type of decisions tells me that NASA has no considerations for costs. They have an unlimited budget at the tax payers expense. Thanks to congress and Predident Bush.