To compare the value grind to HS:
Every 300 cosmic coins gets you a pack. That's 30 wins without a winstreak of any kind. In HS you get 10 gold for 3 wins, meaning you also need 30 wins to buy a pack (100gold). The difference is:
-In Hex the packs are tradeable.
-In Hex you can go on winstreaks to massively increase your earning rate.
-Hex has no cap on earnable coins per day while HS limits you to 100g earnable like this per day.
-You also get some AA rare/legendary which can be sold/traded.
Also this. You get 7 packs just by climbing the ladder, it's not a lot, but if we take how many matches takes to climb to cosmic, we're in a good range.-You can only earn these coins whilst in Cosmic rank whilst HS allows you to earn anywhere.