I was trying to buy Eurostar tickets from London to Lille and looked at the prices on the website. Found some interesting prices (€155 in total) for the days I wanted to book, so I selected them, wanted to pay, but for some reason my registration could not be finalized in the system. So I figured, I’ll first make an account on the website, and then, once I’m logged in, buy the tickets to skip the registration part that you have to do if you visit as a ‘guest’.
This was the first time this ever happened to me (or at least the first time I noticed) and I must say I felt pretty scammed.
Lesson of the day: when prices on the internet for some reason seem to have increased (especially the ones in which you’re ‘interested’) in a very short period: try to erase your cookies or use a different browser and double check if they prices there are the same.