I just started and I wanted to buy 100 atlas bucks for 4.99. I bought it but I had a network error which caused a glitch and I was charged twice. One was automatically refunded but the other wasn't yet Ive yet to receive my atlas bucks. I tried to buy another hundred but the shop told me I already owned the item. So it seems the atlas bucks packs are single purchases. I really hope this is a unique situation because the idea behind the app is pretty awesome.