Ask HN: Is charging in AUD a significant barrier to getting clients?

Without ending up having to use PayPal (and all its potential pitfalls), I'm finding it very difficult to get a payment processor to bill in USD from Australia.

So I'm curious, is paying in a foreign currency (for a US-citizen) a significant disincentive to using a web-service (this one will be specifically aimed at developers and, ironically, billing)?