I have had the rules for a while, but I am getting ready to run my first game. I was doing some math and I want to confirm what I found with you more experienced players.
I have played tons of games where you bought Characteristics and Skills and they somehow added together to get what every you rolled. Skills are usually cheaper where as characteristics apply to more skills. But most games tend to favor one more than the other (From a cost/benefit perspective)
So Let's say you have a 2 in an attribute for a certain skill lets its is agility for piloting. To increase your piloting ability you can buy up your agility or your piloting skill. In Edge of Empire buying up the skill though doesn't actually give you any more dice it just upgrades your dice. A green dice seems to have 5 successes out of 8 possible sides where as a yellow dice has 10 successes out of 12 possible sides. Clearly the yellow dice is better. But getting a yellow dice costs you one of your green dice. Let's do some quick math (10/12) .8333... - ( 5/8) .625....=.208...
So buying up your characteristics increases the expected number of successes of any applicable skill by .625... and buying up a skill only increases the expected number of successes by .208. Buying up a characteristic is three times as good as buying up a skill even if that characteristic is only used for one skill. (This of course ignores all other uses for characteristics like soak and strain)
To me this seems opposite from how it should be. I feel like buying up a skill should be if anything more useful for that skill than buying up a characteristic.
It all comes from the fact that a rank in a skill does not actually give you a dice, instead it upgrades one.