Can a developer change the minimum payment threshold?

Solution 1:

No, you can't change the payment threshold. It'll always be either $10 USD (if your currency is supported by Apple), or $150 USD (if it's not).

Source: iTunes Connect > Resources and Help > Getting Paid

When will I be paid?

Payments are made within 45 days of the last day of the month in which book purchases were made. To receive payment, you must have provided all required banking and tax information and documentation, as well as meeting the minimum payment threshold.

If your bank and bank account currency is listed in this table, you must exceed a minimum payment threshold of $10 USD. All other bank countries and bank account currencies must exceed a minimum payment threshold of $150 USD.