where you get that 14.5% chance for promo?
199/200 is chance to not get promo in a booster 0,995, if you 0,995*0,995*0,995*...0,995 29 times you will get chance to not get promo in any booster 86,47077%, so chance to get at least one promo in 29 boosters is 13,52923%
Last time I checked most boosters was not worth it, but even 10 expesive cards (based on their sold prices in AH) while acounting for their chance in boosters make opening boosters worth it, while counting every other card to be worth 3
But I do not have access to current AH data, so the cards are maybe much cheaper now. (and I also do not know if the promo chance as changed)
