This isn’t a scammy pay to win mobile game, there’s no reason to obfuscate the credit values by making the packs odd values. $5 should get you 500 credits, $20 should get you 2000, etc. We don’t need these things listed with $0.99 and “bonus” credits. Creators don’t want that, buyers don’t want that.
Standardizing he values makes it easier for creators to price appropriately. And it makes buyers feel less like they’re being scammed.