There is a debate regarding buying a cards, Packs Versus Individual purchase on Marketplace.
In my honest Opinion, i will save 100k starbits or more to buy the promo buying 12 packs for only a hundred thousand starbits. There's a good value in buying these packs and there is a chance to get some high value cards.
Just look these legendary cards you can get. Sweet!
1.) L11 Private Yacht
2.) L27 Jux
3.) L28 High Roller
4.) L10 Skyline Tigers
5.) L29 Stradivarius
For each unique cards and total cards on your collection will give you rewards. (Please check the Player Rankings) There is a daily reward pool for everyone.
So for me its more economical or value for the money in buying in packs plus buying packs will support the developer of the game
Personally my favorite now is the L27 Jux card. Insane + stats and kinda will be an iconic thing in hive block chain :)
You have to save alot of Starbits on buying in marketplace for a single card you want.
But still it depends on your preference whether buying packs or in marketplace.
This is not a financial advice and please do your own research before making any decision. :)