My kids play Roblox and get often get gift cards from friends for birthday presents etc. I've always hated that a gift card for $20 can't be redeemed for the equivalent Robux. Instead you get options to purchase Robux and the most you can redeem is about ~$16, so then you have left over cash and have to get another gift card. Dark pattern.
Not really. The lower tiers are only less efficient on platforms that require purchase through an app store or other payment processor that takes a large cut. Buying through a gift card or through the Roblox website or non-Microsoft Store PC app gives more Robux for the same price <https://www.roblox.com/upgrades/robux>. These increased rates are also balanced to prevent the lower tiers from being less efficient: the package for 800 goes to 1000, whereas 10 000 goes to 11 000.
There's an option buried somewhere in there to convert left-over real dollars into robux. They don't make it too prominent else no-one would be sitting there looking at the expensive robux options that offer (mostly, but NOT always!) a better exchange rate.
I mean, League of Legends does that as well. For example you can buy X RP, but a champion or skin or whatever costs either less or more, never the exact amount. I have seen this in hell of a lot of places as well.
