KARA were the only GG that could really come close to their sales, yet they're all not really doing that well solo
SISTAR & 2NE1 were monsters digitally(and for some time did way better than SNSD digitally) yet they're all not doing that great solo
Meanwhile SNSD have:
Taeyeon who continues to smash on charts to this day
Yoona is bagging CF deal & has seen a surge of popularity earlier this year, also a successful actress
Seohyun is doing great in acting too & bagged a hit movie (Love & Leashes)
Sooyoung also doing great in acting
Tiffany came back to Korea & starred in Korean production of the Broadway hit "Chicago" & recently hosted GP999 with Sunmi
Sunny has been doing things in variety
I can only think of Yuri & Hyoyeon who haven't really been doing much....but both appeared on Amazing Saturday last year + Hyo gets alot of DJ deals
The only ones I can think of are 1 or 2 members from some group having a successful solo career (ex: Sunmi, Hyuna, Uee, Suzy, etc) but in SNSD's case nearly all of the members are booked & busy...why?