I am unaware that they are parked for nothing by other states. The US has parked them but this is mainly because the USAF wants to standardize its fleet and operating these smaller transports is less cost effective for it. Just like operating a regional jet is less cost effective per seat than an A320. Doesn't mean that the regional jet is rubbish. It has fewer seats, and for fewer passengers, its more efficient than the A320.
How to explain it better...
The sticking point for the C-130J is that the US doesn't want to give a strategic lift capability to Pakistan. fair enough, the C-27J is essentially a smaller C-130. It uses the same engines as the C-130J, instead of 4 of them, they use 2.
C-130H:
Capacity: 19000 kg
C-27J:
Capacity: 11,600 kg
check out the large number of countries using this. Again, to emphasize, they use the same RR engines as the C-130J. 2 engines are always cheaper to maintain than 4.
Did I miss mentioning that they are sitting in the boneyard and available for free with EDA and CSF? That their airframes have tremendous life left as do their engines?