My club has a 6-week pic rule which is apparently a compromise between those who favoured a 4-week rule and those for an 8-week rule.
The airport lies between two much busier airports and although not complicated really the surrounding airspace is the most complicated north the M6.
Since joining I've flown every month but have twice needed a club check out because of the rule and on both occasions I have spotted significant errors on my part. On one occasion I even "turned-down" my sign-off and the next flight was also with an instructor by my own choice because of poor circuit performance.
As people have said if it isn't your aircraft then who can blame anyone for checking you out!