I've had my PPL 10 years and always flown a lot until this last year or two. I've also let my IMC lapse.
Why?
Work, time, energy, weather, being a wimp.
Work is busier so I've less time and energy (also getting a bit older
). To be confident I need to fly a lot and a combination of work/lack of time and the weather has stopped me flying as much so it's a vicious circle.
It most certainly is NOT because of:-
'old' aircraft - as long as it's well maintained and comfortable, it doesn't bother me what it looks like
unfriendly club - mine is very pleasant
traditional navigation - I like using a map and whizz wheel (and can use VOR/ADF and have a little GPS)
hour building instructors - I've never had a bad instructor and have flown with career, hour building and ex-airline instructors.
problems with hiring - aircraft are usually available and can be taken abroad
not owning an aircraft - I'm not sure I want the commitment, especially as I'm a wimp