To consider flying from these remote airports you have to think not as a plane passenger but as train/bus passenger. Instead of 30 hour train journey your are getting 8 hour train journey and 2 hour flight - for a total trip duration of say 15 hours including transfers. The duration of the trip is reduced by half and the total price is also probably significantly lower - that looks like a very good deal.
And if you think that is still a tiresome journey think about that before Ryanair we had multiple daily direct schedulled bus departures from Kaunas to London full of travelers.