Cat 2 costs "supposed costs" are coming from managers raised in this vision. Days where type ratings were all conducted in planes, etc..
Nowadays CAT 2 is a given ( besides the approval), training costs are identical and maintenance the same (included in every single maintenance manual coupled with RVSM and EGPWS checks)
But the myth is solid, and very few people would get to challenge a "stiff" chief pilot on this subject. Again, it is not a matter if you have to shoot all day long CAT2 approaches ( Autopilot does anyway), but it is a DISPATCH criteria for take off ,en-route and destination alternates ! thus saving fuel, or being able to go on routes that would not be available legally.
On top in case18 RVR=300 remove slots in marginal weather conditions, magic.
So please : STAY out of CAT 2 approvals, likewise we will fly your passengers next time :-)
CAT 3B ( falcons) is another story on training, records, etc... more paperwork indeed ( although not impossible, but the first two years are a bit a pain in the ...)