Highly desirable dishes and mounts for the right party, but might not warrant the removal cost. The trailer mounted dish is of interest...
How many stories (feet) high is the roof. Is there access to the antenna positions with a boom truck from the ground (private parking lot, etc. or from public roadway)? Not much cost or labor to lift dishes and mounts directly from install positions, but if the dishes, mounts and ballast would need to be first disassembled and moved to a removal access area, it will become a costly multiple day removal by a crew.
In my opinion, it would be worth removing for reuse if the job could be completed by direct lift with a boom truck, sling and ballast bucket. An insured and bonded boom truck and crew would be the least expensive for a day minimum starting at $2k.
If each dish and mount required disassembly and movement along with the ballast to a roof location accessible by a boom truck or if the parts required manual lowering, it would likely be a multiple day job for a crew and best to contract with a disposal company. This option would likely cost $5-10k.
If permits are needed for accessing from public roadway, add time and cost... One must also consider the wear and potential damage to the roof by crew or mount removal.
Were you able to discuss removal options with any tech who may have serviced the satellite system in past years?