Well, as someone who has an '07 bike and just added up the cost of all the parts I've added, (many of which this bike also has - or comparable alternatives), I don't think it's a bad price really. (it's pretty low milage for a six year old bike).
The debate just had on the forum about this concludes that one never gets the price back from the investment if you sell it with the bike and that standard bikes often go for a similar price to one that has all the work done on it.
But you really have to ask yourself what you would do if you got your hands on a good condition standard bike, say for the going rate of realistically £4,000 - £4,500. If you wanted to do the SAS and get and airbox and exhaust you will be looking at a minimum of £800 - £1000 for used parts and maybe upwards of £1500 for new. Then add on the cost of remapping and a PC111 or similar and all the other bits that improve the bike. This forum is addictive and it's hard not to want to make all those mods and upgrades when you read about them!
So a lot of people end up spending upwards of £6,000 to £7,000 anyway. If you feel confident that it's been done well then not just buy a bike that's already been done?
The only think I don't like about this bike is that it's had six owners.