New product launch?

[Pim]

It's also worth pointing out that here in the UK at least back in 2013 when the D110/170/240 were introduced, prices were not far different than for the Pro series now.  Looking at whathifi.com the D110 retailed at $4490, D170 for £6,390 and D240 for £11,800. Pound Sterling against the Euro was marginally weaker back then by maybe a couple of percent so not a big difference.  
Prices now show the D130Pro has gone up about 11% on the D110, D220Pro has gone up about 10% on the D170 price, D250Pro about 6% on the D240. But then you're also getting more for your money in terms of power and (hopefully) sound quality.
Not trying to defend Devialet here but comparing end-of-run (reduced) prices versus newly-introduced models is not a particularly fair comparison.

Also it gets complicated elsewhere in the world as prices do seem to vary quite a lot.

You have a point there Rufus. For me in Australia it worked out the other way around. I bought my 200 when the Aussie dollar was above parity with the US$ and paid AU$9,350.- for it. The standard retail price of a 200 now is set at AU$11,600.- so if they top that up by 20% or so for the 220Pro the cost will be AU$13,920.-. That's half more then what I paid for my 200 (170 at the time)

So fluctuating currencies have a huge impact on the cost. That said, now I have an O d'A waiting at home, if I sell the 200 on the world market, I might not loose as much as others since the Aussie dollar has dropped considerably.