The UN is quite a sizable organization. There are a lot of administrative people, clerks, translators, buildings, etc. So there is quite a bit of expenses to run the organization. The existing members have already paid for this and is still paying for it through regular membership fees. So new members need to pay a fee to get up to date on their payments to be equal to the existing members. A large part of this registration fee is spent just processing the registration. I even think that the UN probably loses money when countries join as the fee is actually quite small for what it is.
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