Well, BLFO, since you asked
. Counting all the cards serves me in different ways. The quintessential card can be a kind of summary of the reading, proving what underlying energy I had already felt. Sometimes it can give me advice on what to do next, especially if no such position existed in the spread, or if I feel I know what's going on now but not how to go on from this point. Sometimes it creates a whole new aspect of the issue, one I hadn't considered before.
I rely purely on intuition whether I use this method in a reading or not. I've had times when I had figured it out and found it didn't help me at all but was confusing the reading even more. Weird thing, this qunitessence.
Ah, how I count: Ace to 10 count their value - so 6 of Cups counts 6. Majors count heir value, too - Temperance counts 14; BUT Fool counts zero because its digit is indeed zero. Court Cards count zero, too. I don't know why.
I add them up and if it is below or equaling 22 then it's the Major Card of that number. 1 = Magician till 21 = World and 22 = Fool. Some neglect the Fool because they feel that you can't add up to zero - which indeed you can't. But I want to give him equal chance with the other Major Cards. If it is above 22 you have to reduce to a number equal or below 22.
I guess each reader has to find his own way of dealing with this. I had readings over in the readings exchange where readers didn't come up with it at all and some did it only when there were no Majors in the reading. So, it's up to you. You have to make up you mind about it, if you like it or not cause some time or the other you will have to face a situation where you will need your thoughts about this subject.
Blessings, Astraea Aurora