finally i got a chance to get a second opinion why my tires have cuppings developed.
Tire rotation maybe one of the cause, but the tire plus stores says there is misalignment on my car that they suggest it is necessary to be corrected.
I am going to talk with the Toyota dealer tomorrow and ask why there weren't anyone telling me that my car was misaligned.
Misalignment has been an issue since delivery, which the car was misaligned on the delivery day. The steering wheel is not aligned correctly. As a result, they performed the alignment, but they over did it, so they perform it again.
Luckily I follow suggestions here from all of you to check the alignment first, or else I will waste my $$ on tires. I was trying to get Michelin Energy MXV4 S8 and it costs a whooping $192 per tire!!!! unbelievable!