My club has similar rules. Also on minimum aircraft usage during the time you book - you are supposed to fly at least half the time of the slot you booked and if you book an aircraft a full day you're supposed to fly something like 2.5 to 3.5 hours a day minimum (weekday/weekend rules).
But these rules are applied with a fair bit of common sense and consideration for the purpose of the flight. Weather and everything on the I'M SAFE list is not questioned whatsoever, except possibly by the people hanging around the bar. Also, for example, if you take our aerobatic aircraft for an aerobatics contest, and you arrange things in advance, it is understood that you won't be flying for 3.5 hours per day at least.
And it's also a matter of who you are and who you know. If you fly regularly and on the ground behave as a nice, caring person with an understanding on how a club works, and you want to take an aircraft to a foreign country for five consecutive weekdays, knowing (and making clear) in advance that you won't be reaching the minimums, and there is plenty capacity that week, then nobody is going to have a problem with that. Whereas if you don't fly regularly, are an unknown face at the club/bar, and only tend to book an aircraft for a full (glorious weather) weekend and return Sunday night having flown a whopping two hours in total, you've got a problem.
In the end, it all comes down to managing aircraft/instructor utilization. Without rules you have anarchy, but with too many rules and too strict an application of those rules the people who pay for all of this will simply run away.