I think at times CD that us laypersons tend to conclude that when mention is made of wage structure and enhanced offers we tend to link them together.
In truth an enhanced offer could easily be made without breaking from the wage structure. i.e. a players total package is structured to include a signing on fee, a term of contract, a basic salary and various bonus's based on things like appearances, wins etc. This is the wage structure that a club will try and stick to. Whereas an enhanced offer could easily mean a little more money in basic, a little more in signing on fee, longer term contract and may even include the club paying the agents fee. It may be that the enhancement is x £'s a week more but the deal is for a longer term. This still fits in with the structure because if, for example, we offer another £300 a week for a three year deal, in two and a half years we will have paid the guy £39k extra before he comes back to the table to negotiate further, whereas, if we give him £200 a week over two years, although we pay him less (£15600) after eighteen months he's going to be back looking for another signing on fee and even more money which would likely, if we want to keep him, result in us paying out even more in the long term. Does all that make sense?