Here, bookmakers Paddy Power crunched the numbers to take a look at each League One club and their net spend over the last decade – and there are some pretty shocking results.
However, not every third 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:
7. Crewe Alexandra
Net spend over last 10 seasons: +£10,010,000 Photo: Gareth Copley
8. MK Dons
Net spend over last 10 seasons: +£9,490,000 Photo: Catherine Ivill
9. Swindon Town
Net spend over last 10 seasons: +£6,290,000 Photo: Michael Steele
10. Doncaster Rovers
Net spend over last 10 seasons: +£4,250,000 Photo: Daniel L Smith
11. Bristol Rovers
Net spend over last 10 seasons: +£3,680,000 Photo: Harry Trump
12. Portsmouth
Net spend over last 10 seasons: +£3,360,000 Photo: Naomi Baker