We already have that on the site:
https://www.pricecharting.com/game/pc-games/final-fantasy-xi-chains-of-promethia
Older games used rating systems like BBFC before PEGI. For example, I have a promotional copy of Half-Life 2 that is PAL but has a BBFC rating of 15 instead of a PEGI rating
pricecharting.com/game/pal-xbox/half-life-2-promotional-copy-not-for-resale
I have noticed when entering “your cost” as part of the collection it appears to add it as US dollars and not the chosen currency, in my case AU. This gives a false indication of monies spent on a particular item.
Specify whether the value is USD, AUD etc so other country's know whether to convert it or its already converted
All prices in our database are in USD so the prices are always converted to USD no matter what the local currency was for the exact item.
So you should always convert prices to AUD or other local currency if you want too the local currency equivalent with today's exchange rate.
Ability to set the filter of the collection or have separate tabs on collection for Nintendo, sony, etc.
Let us know what features you want on PriceCharting.