Most of that becomes irrelevant when you consider that there have been plenty of 5-15mil buys who could and would do better than Welbeck and are just better players. Also Berbatov is just far far better than Welbeck.
4 of the top 10 current league scorers cost sub 5mil didn't they. RVP, Ba, Yakubu(can't actually remember what they paid for him 3mil or thinking of someone else?) Grant Holt.
THen look at the rest of that table and most of those guys outscoring Welbeck(at worse teams) cost very very little.
You don't have to spend 30mil to get a player WAY better than Welbeck.