Every site is different and just depends on what the site is offering that is of value to users.
digitalpoint.com ($25-$125):
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outgress.com ($10-$100):
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inmateintake.com ($100-$750):
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cookieforensics.com ($25-$100,000):
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I had to make an addon that makes Bitcoin and Monero a form of payment simply because it's impossible to accept $100,000 payments via PayPal or Stripe (users can also pay via check or wire transfer, but it's not automated).
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The sites are vastly different, serve a completely different user base and are priced differently based on the value brought to the subscriber. Without knowing what you are offering to your users, your question might as well be, "What can a business charge for a service?"