For what it's worth, I ended up paying $4k to purchase my 5th-gen two years ago from the original owner with 6.2k miles, in near-showroom condition with a TBR high-mount exhaust, cover & a Yuasa maintenance-free battery charger. However, I did have to pony up a few hundred more afterward to purchase replacements for the viffer's14-year-old original Dunlops.
Do I feel that I may have paid too much? Yes. That said, do I regret the purchase? Nope!
Some have claimed that the 5th gen may be the best (and looks like it could be the last) VFR equipped with the bullet-proof gear driven camshafts. Considering how long it's been since production was discontinued (12+ years), frankly I've been surprised by how many low-mileage 5th-gens I've observed for sale since I purchased mine. However, I find it hard to believe that there may be very many more of them out there. So if you really want to end up with one, opportunities like this one may be few and far between.
I've noted that the seller wasn't completely honest in his listing:
"New tires": Even w/zero miles, tires manufactured in '07 clearly aren't new
"All the services have been completed": Not true (at least in my book) if it's been two+ years since brake & clutch fluids, or any other fluids were last flushed & replaced.
I replaced the brake & clutch fluids & bled the systems immediately after purchasing my viffer in Feb. of '12. I did not find doing so to be all that hard, but afterward I still felt the front brake felt a tad soft-although the braking performance has (for me at least) always been more than adequate. So the softness you felt could just be normal for the LBS on a 5th gen. Also, considering the age of the motorcycle, replacing the brake lines (especially w/a upgrade to braided stainless steel lines) could provide a significant improvement.
Note: I have not replaced these lines on my vfr, but have considered doing so.
Have you asked if the owner had made any upgrades to the charging system? If not, you should consider the possibility that installing a VFRness, RR, etc. could be in the bike's not-so-distant future. Note: mine now has ~ 18k miles and based on readings observed from the voltage meter I installed ~ 10k miles ago, my vfr's charging system voltage has been gradually dropping as the mileage increases and I'm preparing to order some upgraded components from wiremybike.com soon.
Just a few things to consider if you decide to make the seller an offer.
Good luck!
Carey