What you say about accounting is correct, but gross and net spend are not about that. They are there as a clue to a clubs overall transfer policy and behaviour. Thus when we had more coming in than going out last year, the press insisted on calling it a transfer profit. I pointed out then that it was a cash surplus, not profit. As I said elsewhere, if you want to go thru every clubs accounts to discover the true position, you are welcome. Meanwhile I will take Transfermkt’s numbers (however inaccurate) at face value as a rough guide to behaviour.
Example: I have never looked at Chelsea’s accounts, but I know from transfermkt‘s numbers that they had a policy, when it was allowed, of signing up swathes of youngsters and, lending them out, and finally selling at the most opportune moment.
One Italian club a few years ago (I forget which, Chiesa?) had 87 youngsters out on loan at one time. Only close scrutiny of their accounts would have revealed that, but page 2 of their entry in Transfermkt made it very clear at a glance as they sold them off.
I spent a lifetime studying markets and the players therein and of course the accounts were the most important piece of hard data. But the clue was often in the soft data, for example visiting a store and talking casually to staff and gauging their training level. ( I forecast the troubles of M&S this way).
Accounts are hard data (real world), net spend is soft (analytical).
Sorry, I’ve wittered on far too long, but I will not cast aside net spend lightly — the advantage of not being an accountant.