why brazil cvv is so difficult to card online ?who knows more about it ?lets deal

[Seaborgium]

i got some brazil cvv.
it seems like brazil cvv is difficult to card online ?
i can only pay $100~$200 each card at the most.
its problem of my IP ?my antidetect system or any others ?
i am really confused.i need help.
who has experience about brazil cvv ?
please share your mind or lets deal together.
really appreciate.