I asked you to repeat the example, to point out that the difference in your numbers is because McT earns 10 million less a year. My understanding of when people say that academy players are pure profit, is that all other things are equal, including wages. You've used an example of a high earner, but that is not always the case.
The other thing you're missing is that the 28M for Sancho is not a sunk cost. The 42m portion is the sunk cost. So the 28M has to be deducted from any sale price, which would not be the case for an academy player.
Nope, sorry. You're wrong on both counts.
Item #1. There would be no net difference to profitability from selling McT and Sancho, even if they were on the same wages. I thought it was clear enough just going over things high level, but if the math helps I can show that too.
McT 24/25: £3.1M salary, zero amortization fee.
McT 25/26 (assuming option exercised): £3.1M salary
McT if sold: zero salary, £25M fee
Net difference: improves our profitability by £31.2M over two years compared to keeping him. Frees up the full amount this year
Hypothetical player with McT's wages but £70M transfer fee - 24/25: £3.1M salary, £14.4M amortization (72M fee divided by five year contract)
25/26: £3.1M salary, £14.4M amortization
If sold: zero salary, £25M fee. Amortization gets pulled forward, meaning we take a £28.8M amortization hit this year, which reduces our spending power. Importantly though, the amortization fee is a sunk cost, so we still get all the cash
Net difference: improves our profitability by 3.1 + 3.1 + 25 = £31.2M
The money would be the same for both players. The previous transfer fee paid is irrelevant, and the concept of "academy players are pure profit" is bogus except on short-time horizons. Long-term it makes no difference.
Item #2. Yes, the £28M in remaining amortization for Sancho's transfer fee from BVB is a sunk cost. It will be on our books no matter what we do with Sancho: play him, extend his contract, loan him, sell him, etc. That's amortization remaining from the transfer 3 years ago and there is nothing we can do about it.