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When getting the loans right from a young age you increase the value too. Livermore sold for £8m, Carroll £5m, Caulker £8m, Townsend £15m, Mason £13m Pritchard £8m. Now we let Edwards go for nothing apart from a sell on clause and Markanday for 500k
The point of loans is to give youngsters the chance to play men in meaningful matches 0 and the loanees should get great experience which may equip them for playing in Spurs first team matches, including pre-season.
The best if them we hope to keep on (Kane, Skipp being obvious examples) with the others given enough playing time so they attract good fees if they move to other clubs - the ones you list were part of £100m raised just after Poch joined , although sadly too much was wasted on poor buys such as Sissako
He wasn't a big fan of loans wanting to get youngsters training with first team instead, That change in process didn't work so we didn't get players through to first team (other than Winks) nor gave them experience to attract decent transfer fees. Loans are now back in favour at Spurs (one of few things that Mourhno got right) but we di need to get better at them so we get more first team players from academy (even if only for a couple of seasons such as Townsend and Carroll did) as well as sales of players deemed not quite good enough for us who can get a decent career elsewhere