The alleged $9.5B yearly pricetag for F&S has been tossed out in other references without backup.
Another claim is that it only benefits a tiny percentage of SS recipients -- less than 0.1% causing "the unnecessary drain on the Social Security system", per this AARP article:
Budget Act Safeguards Social Security, Medicare for Older Americans – AARP
That would make 1/1000 x 60million = 60,000 filing for F&S, give or take, each collecting $158,000/year. Seems a bit high.