In Dropbox example both include VAT. You can see this tendency clearly in digital games. When I worked with games pricing for MacOS, I asked why such a huge difference? Boss replied: "It is the easiest to force Europeans into premium costs".
There is even a chrome extension which shows how much a game costs in different countries on Steam website:
Buy Sid Meier's Civilization V
US: $29.99 (18.04 GBP)
RU: 249 pуб. (4.01 GBP) (78% )
CIS: $14.99 USD (9.02 GBP) (50% )
BR: R$ 44,99 (12.11 GBP) (33% )
UK: £19.99 (11% )
EU: 29,99€ (23.7 GBP) (31% )
AU: $69.99 USD (42.11 GBP) (133% )
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Also not long time ago there was an article about Spotify pricing [1]. It simply is a many years ongoing Europe rip-off.