"You need to pick a large market if you want to raise venture capital investment. A business that makes £10m profit per year may look great to you, but it's small fry for a VC."
If one is making 10MM a profit a year, the company is clearly worth >= 10X the amount. I am no VC, but I would assume most VCs would be drooling over investing in such a company.
I definitely think there's something in the individual's secondary market and the competition that exists, e.g. B4W and also the online forums, prove this. It would also be nice to arrange selling of smaller quantities than cases. Just wasn't sure if that would reach the numbers in the OP's point.
This gives us several angles to attack. Market size was a concern when talking to investors - and we took money from people who would be happy with that kind of scale.
Many angels and small funds will be happy with £10m/year - it's just a case of picking the right type of investor for your company.