I sent a message to Netload support about the payout limitation yesterday and they said the same as Charles.

"Hello,

via alertpay you can only request till $300, via bank or paypal you can request as much as you want.

If you have any further questions, please don?t hestitate to contact us.
Thank you for using netload. Best Regards,
Katja"


Simply do not use Alertpay as a payout method and you will be fine.(hopefully