ohh i did not know that i thought it be similar to magazine covers
like when wall street journal did individual covers of bts, the number of sales were visible for the first few days on the website so solo fbs started buying in bulk, like literally cartons upon cartons of magazines, just to "show their support"
It was never like that with the albums that had individual covers in the past. It's just the same product. Doing it otherwise (ie releasing them as different products) would be silly since it would harm the album/group's total sales.
The whole thing is really silly and unnecessary, you get the exact same content but with a solo cover and most of the time you can find the solo covers inside the album as part of the photobook anyway.
The only time I thought individual versions were a genius idea and understood their temptation was when SM released individual versions with entire photobooks dedicated to individual members in SNSD's I Got A Boy album in 2013, it wasn't just a cover but an entire photobook