Hmmm I haven't noticed but then again I just kinda let the items go on auto-pilot and ship as they sell. All my items auto re-list themselves. I am also no longer setup as a store.
example:
for something I sold today
Progress Lighting P3727-10 Flush Mount Ceiling Light
Final price: $60.00, 6 items @ $10.00 (Store) 190466280789 May-25-11 12:21:34 PDT Final Value fee US $7.20
and something that re-listed today
Progress Lighting Masira P4045-27 Nine-light Chandelier
190505711566 May-25-11 12:08:40 PDT Insertion fee US $0.50
Progress Lighting Masira P4045-27 Nine-light Chandelier
190505711566 May-25-11 12:08:40 PDT Gallery Plus Fee US $1.00
Progress Lighting Masira P4045-27 Nine-light Chandelier
190505711566 May-25-11 12:08:40 PDT PicturePack fee US $0.75
Progress Lighting Masira P4045-27 Nine-light Chandelier
190505711566 May-25-11 12:08:40 PDT Listing Designer fee US $0.30
EDIT. It appears that the prices did go up. Here is an item that I sold in January.
Progress Lighting Timberbrook Chandelier P4285-84 190471570182 Final Value Fee $8.70
Final price: $95.00