The tax avoidance issue is hard to ignore. But we are in a strange, in-between state where the old, easily monitored bricks & mortar world and the new digital world are co-existing uncomfortably. And while it's easy to ignore taxes when you're buying something small, the more you're spending, the guiltier you (well, ok, I) feel about spending the money in the first place, and the easier it is to talk yourself into illicit bargain hunting.
I can semi-justify it to myself by looking at my shrinking pay packet (wrt inflation), or by the fact life's short and I can't solve our national debt on below average earnings. But ultimately it is stealing from yourself, because we all suffer from the consequences of a reduced tax base. However after waiting 5 months for the NHS gears to grind their way towards allowing me an MRI to find out why I'm unable to stand up, walk, or work without pain, despite keeping the co-codamol suppliers in business, I'm tempted to see this as a way of recouping some of the £300+ I've wasted on an osteopath.
Whether I will order a camera from abroad or not will depend largely upon whether I ever get fixed. I don't need a 70D to take pictures of my short hobble to work and back.
Personal circumstances don't alter the fact that tax evasion is a crime though. It's just not one an increasingly trans-national world has worked out how to deal with yet. That's a political problem as much as a personal one.
As for the high street issue... I turned 50 this year (which explains the knackered back), and bought my first camera when I was 18 after working hard for a summer. I bought mail order because I couldn't afford shop prices.
Over the years I've not bought huge amounts of equipment (I never had the money for large parts of that period!) but I've used various high street stores. I can't remember a single occasion when I felt the retailer knew more than I did on the kit I was looking for (even if they had stock), or when I felt I was going to be paying for genuinely useful service.
If anything, quite the opposite, leaving me with the impression that high street has always been for people with no knowledge and little interest in the hobby. I'm sure there are, or were, great independents out there, and individuals within chains who were real stars. But I never met any of them.
Perhaps if I'd been in a position to spend more money, or a Pro able to ignore prices because it's a business expense, I might have discovered better service and developed better relationships. But personally I think forums like this are as much to blame for the death of the high street as Amazon or Digital Rev. We have better collective knowledge than any store can offer, and we share our knowledge for free.
No shop can compete with that. So we are all part of the problem.