I used to have no problem selling my £10 Amazon vouchers for £9.50 on e-bay. They literally flew off the shelves, so you could probably charge a bit more and still get buyers.
The e-bay listing fees, final value fees and paypal fee will take a chunk. (The price you pay for a secure sale

)
Think it worked out I got £8.61 take home for each one after all that.
So don't let folk take the piss, telling you to knock off 50/60 quid. You could buy the £10 vouchers and sell them safely to strangers on the internet and get at least £200 back from your 32,000 FPPs.
What you're offering at the moment is a really good deal for someone. Save £30 and get the warm fuzzy glow that comes from helping out a fellow blondite.

This isn't 2+2 where we're all looking to squeeze every last penny out of any transaction. The man could probably stick it on e-bay and sell it for £235 to thrifty unknown, pay roughly £15 in fees and get his £220 that way.
Canuck certainly isn't wanting to screw anyone here, he is offering a fair deal.