Hi! The reason why some items are not available to exchange in the "Get Bet Chips" tab in space time and redeem other items in the "Redeem For Items" tab is because only specific items were implemented into this feature. This does get updated over time with the addition of other items. No, it was not forgotten, it just was not implemented yet =p

I will forward the suggestion to include other items in both tabbed features. In the future, please use the "Suggestion Thread" found in Bug/Support section here. You c*so give your suggestion to Customer Service directly here.