The answer is simple.
If you leave the aircraft parked outside for a year in our typical english weather, even worse if it is close to the sea, expect some expensive engine work plus possible airframe corrosion and almost certainly mouldy upholstery.
OTOH if you keep in in a hangar and run the engines up to temperature maybe once a month it will repay you with low maintenance and a high resale value.
As with any mechanical contraption, look after it proprly and it will look after you.
Neglect it at your peril.