Here, bookmakers Paddy Power crunched the numbers to take a look at each Championship club and their net spend over the last decade – and there are some pretty shocking results.
However, not every second tier club has net spend in the minus column - scroll down and click through the pages to view the full club-by-club break down:
. BOLTON, ENGLAND - OCTOBER 29: A general view of the EFL official match ball prior to the Leasing.com Trophy match between Bolton Wanderers and Manchester City U21s at the University of Bolton Stadium on October 29, 2019 in Bolton, England. (Photo by Lewis Storey/Getty Images)
A general view of the EFL official match ball prior to the Leasing.com Trophy (Photo by Lewis Storey/Getty Images) Photo: Lewis Storey
. Blackburn Rovers
Total net spend over the last 10 years: +£41,460,000 Photo: Ross Kinnaird
. Nottingham Forest
Total net spend over the last 10 years: +£17,730,000 Photo: Laurence Griffiths
. Preston North End
Total net spend over the last 10 years: +£14,740,000 Photo: Alex Livesey
3. Birmingham City
Total net spend over the last 10 years: +£61,690,000 Photo: Mike Hewitt
4. Blackburn Rovers
Total net spend over the last 10 years: +£41,460,000 Photo: Ross Kinnaird