Whilst I agree, nobody should be paying 6 bucks for coffee and toast, you haven't felt the pain of getting breakfast in Sydney! Makes $6 look like a special!
Overall, the prices in the US for many commodities and services are ridiculously cheap compared to many European countries for example. And don't get me started on the gas prices...
You can't get a coffee and a toast in a cafe for $6 in my home town (in Europe). You'll be paying $8 to $10 at least.
£3 should definitely buy you a semi-decent coffee though:
http://www.londontoolkit.com/blog/eats/coffee-shop-chains-in...
In Stockholm you can pay $6 for a cup of coffee alone. Ok maybe not cup of black coffee but $6 for a cup of cappuccino is no problem.