You raise alot of good points. The main reason alot of these drops aren't as common as you'd like, is mainly due to damage control.
With there being so many items on the rev drop table, items are going to drop alot more frequently than their coded rate, So with that in mind, we made them lower than intended. We can now buff the underwhelming drop rates, without having to nerf ones that could have caused eco damage.
Any other drops you feel should be added / Removed please voice your opinions and we'll make sure we get around to reviewing them.