The joy in buying an airfix kit is in the 'building' it, yes?
So if the kit requires more effort and time to build it's actually *better* value for money!
Back when I was a lad(*), I used to balance out how much a model cost compared to how long that same amount of money would last buying drinks in the pub; especially if the model has some further use in a railway or gaming. So a kit that takes 4 hours to build is worth a Nights Out of beer, yes?
You have to add to that the joy of making a kit you last put together in the '70s but with.. a few... years extra experience and skill.(**)
(*) Of a callow 20 years
(**) We won't mention the eyesight and fatter fingers, those don't count!