You know it's funny, I was attending a seminar for CSS subject selection last night where one of the co-owners was delivering his speech on the matter.

While discussing the merits of CSS and how it would help in various other exams such as PMS, he mentioned how it would be relatively easier to be allocated when 160 plus seats are meant for Punjab (PMS) only.
Then, basically drawing a comparison as to how it's easier to get one out of 160 plus than 25 from CSS when competing for an Assistant Commissioner's spot.

He even went on to state that they didn't regularly conduct PMS exams in Punjab (usually every two years or so) but now they intend to make this a yearly affair. Though, I don't know whether to take the guy seriously anymore. :p

Thanks for bringing this to light.