OK, I was thinking about the rarity system and trying to get a good grip on what to expect from a booster. The only # we know for sure is that Us are 1 unit in 6 boosters. Based on a production run of 20,000 boosters I came up with the following guesstimate:

Infantry
Rarity 1: about 50% of infantry are rarity 1
Rarity 2: About 33% of infantry are rarity 2
Rarity 3: About 17% of infantry are rarity 3

Vehicles:
Rarity 3: 50%
Rarity 4: 33%
Rarity 5: 17%

Mechs:
Rarity 3: 41%
Rarity 4: 28%
Rarity 5: 14%
Rarity 6: 17%
(Note: adding uniques in here screws up the distribution . . .so lvl 5 mechs are RARER than uniques!)

So, there you go . . .am I right? Am I wrong? You tell me!

and people wonder why i stopped buying bosoters and went to the seoncdary market

That Elite units are about as rare as uniques should be roughly right from personal experience.