Bo
"Any entity that wants to offer domain name registration services under gTLDs with a direct access to the gTLD registries is required to obtain an accreditation from ICANN. To that end, the interested entity must apply for accreditation and demonstrate that it meets all the technical, operational and financial criteria necessary to qualify as a registrar business. The relationship between ICANN and every accredited registrar is governed by the individual Registrar Accreditation Agreements (RAA), which set out the obligations of both parties."
http://www.icann.org/en/registrars/
"What you will pay to ICANN:
US$3,500 non-refundable application fee, to be submitted with application.
US$4,000 yearly accreditation fee due upon approval and each year thereafter.
Variable fee (quarterly) billed once you begin registering domain names or, the first full quarter following your accreditation approval, whichever occurs first. This fee represents a portion of ICANN's operating costs and, because it is divided among all registrars, the amount varies from quarter to quarter.
Transaction-based gTLD fee (quarterly). This fee is a flat fee charged for each new registration, renewal or transfer. This fee can be billed by the registrar separately on its invoice to the registrant, but is paid by the registrar to ICANN.
Please refer to
http://www.icann.org/general/financial.html for the most recent ICANN budget to find additional details about the quarterly variable and transaction-based fees, including possible options for relief.
Please refer to
http://www.icann.org/financials/payments.htm for instructions on how to submit payments to ICANN."
http://www.icann.org/en/registrars/accreditation-financials.htm
Also (taken from same page)...Applicants seeking initial accreditation must demonstrate the ability to procure liquid capital immediately available in the applicant's name at the commencement of the accreditation period in an amount of
US$70,000 or more before the ICANN accreditation becomes effective.
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The $70,000+ might be worth it if you can catch an expired premium domain or two. Plus, you could actually make money as a registrar, i.e., compete with the biggies.
But hey, godaddy has tons of servers and is a licensed registrar, but it cannot compete with namejet and snapnames when it comes to backorders, so what chance will you have?; unless you creat a zombie bot that infects millions of computers and use them to catch expiring domains. Just kidding on the last part.