KaseyKeller:
I found this list for the EPL prizes last year, I think 10% drop was pretty close but it seems to scale off more rapidly at the bottom.
2010/11 Premier League prize funds:
Manchester United – £15,120,000
Chelsea – £14,364,000
Manchester City – £13,608,000
Arsenal – £12,852,000
Tottenham – £12,096,000
Liverpool – £11,340,000
Everton – £10,584,000
Fulham – £9,828,000
Aston Villa – £9,072,000
Sunderland – £8,316,000
West Bromwich Albion – £7,560,000
Newcastle United – £6,804,000
Stoke City – £6,048,000
Bolton – £5,292,000
Blackburn Rovers – £4,536,000
Wigan Athletic – £3,780,000
Wolves – £3,024,000
Birmingham City – £2,268,000
Blackpool – £1,512,000
West Ham United £756,000