Not sure if this still rings true- the data is 2 years old ( nov 10 2010). Assuming they have not changed gold box and gold pack rates here is what you can expect on Friday and make good purchase decisions.
Analyzing the data provided yields this so far
23 packs bought:
1 x 5 star
2 x 4 star
34 x 3 star
At a cost of 300 gran per pack this is 6900 gran. Now I'll compare this to the results of the set 7 gold boxes data i tried to analyze.
Averaging the results posted, we can roughly conclude that a gold box will yield:
1.6 x 5 star
2.6 x 4 star
6 x 3 star
The most common set, out of 14 posted was 1x 5 star, 3x 4 star and 6-7x 3 star
When you compare the 2 options-purchasing gold boxes at 3600 gran per box versus buying gold packs you are clearly better off buying gold packs- 2x gold box vs. 24 gold packs. It is a difference of 20 x 3 stars!!! Weigh this against getting perhaps an extra 5 star and perhaps 2 more 4 stars
Nought's had, all's spent, Where our desire is got without content;'Tis safer to be that which we destroy Than by destruction dwell in doubtful joy.