well, pgf from begging in Ultima, was an event drop, so it should be like that, only problem was removing pgf from donations list, like others items, that is the big problem that make economy like it was.
and for "special" drops, i only can see STA, SOV, zondebacon( and others that was made for ultima only, cant rename all), all that special items made for/to Ultima indded make them event only and not in donation list, all others it should be there to make a more balanced economy without all that crazy values.
about time to hunt and so, well, i hunt alot with no luck, and hunt a few with extreme luck. or you play or not, even if its in an event like pgf drop( hard to drop) drops are just like that.
edit:
thats just my opinion, nothing against anyone, you all are rigth on your opinion