Yes I understand that, but you are talking about Gylfi at a 50% discount to Rom. So in this case the "large chunk" that you speak to is pretty much accounted for in that discount.
TBF though I don't know that I believe Rom is that far off of his peak. I think a 25 a season striker is exactly what he is. There is nothing -absolutely nothing - wrong with that, but i just don't know that he will add that much more to his game.
I don't like the fee for Gylfi, but I guess my point may be more that i think the market is truly what i don't like. In a market where Kyle Walker is worth 50 and Rom is worth 90 then sadly Swansea may not be out of their gourds for asking for 45....
The fees are that high because of the calibre of player and teams involved in the deal.
You haggle and inflate the price when the big sides like United, Real etc come calling as they've got it to burn.
What adds to this barmy flux in prices is when mid-table sides or any club outside that money list start throwing £50million at a good player in a bad side.
The precedent will be set in terms of us. That £20mill for Giroud for eg goes to £30mill. We go to attach any kind of quality, minus any buyout clauses, Siggurdson will be the yardstick clubs will follow.