Accounting is something we don't want to talk about but we cannot entirely ignore either.
In order to comply with accounting standards, the cash-out of AppBounty Credits as Gift Cards is limited to $100 per month.
In case you received respective notification, it means that you have reached your monthly cap. Further reservations will be available starting from the next calendar month.
If you have any question, please reach out to our customer support and we'll be happy to help.
Thanks for your understanding!