No Heirloom!!!!

Usually spending low amounts constantly isn't very effective in games where you need to open packs (and a lot of them at that). I would recommend buying larger amounts of coins and packs at once and waiting longer in between. This is the nature of the game and the packs system. I do agree that the number of packs the game gives you before lvl 500 is pretty lame. But if you are spending I would consider spending more at once then a little over time. In terms of your friends its just luck