Is the transaction fee in virwox high? And does they have a maximum amount to convert? I am also interested to convert my balance.
The fees changes based on the payment method you use but yes, overall, It's high. There is maximum and unlike other exchanges, limits are not raised by verification but by time so you need 10 days for level 1, 30 days for level 2 and 60 for the level 3 which will allow you to buy a maximum of 400 Euro per 24 hours (PayPal or Skrill), there is a level 4 but It's not on request so you will have to contact them for it.
Is it even possible on Payoneer? Have ever experienced it before?
I used a few years ago and I asked them about it. IIRC, you will have to fill some documents or send proof but yeah It's possible to chargeback.