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You need the full name & passport to be able to book a flight though. I'm not sure how the agencies can re-sell the flights later on?

I'm assuming agencies do that to lock the prices early on for the flights that they know will be fully booked. If airlines didn't do the nasty tricks with the prices changing every minute, this approach wouldn't work, though.

They can ask that in their UI and skip Ryanair upsell process for you.

That sounds like an excuse and not a reason.

Name changes in a ticket are very expensive in low-cost airlines, unless it's like a typo.

It costs £115 to change the name on the ticket so not sure how it makes any economic sense.