although I love to travel, my recent experience(s) in the US were not exactly nice. Ever since I have decided not to use credit cards any more, I was treated like some alien wherever I went in the US. It appears like the entrance fee to the US (your visitor visa) can only be paid with a CC (or with huge hassle). Hence, I don't really plan to go to Amiwest.
I'm happy to attend a Skype conference or similar.