I doubt it is bait and switch. Most likely to be a Nigerian scammer who will try to get you to pay a deposit by means of an Am***on Voucher. If you have 5 mins to spare it is good fun leading them along giving reasons why you can't pay a deposit. Same photos are used on loads of sites in USA.
I have a sneaky suspicion that this scam is a major operation and is run on sites worldwide hence the same photos appearing on escort listing sites all over the place. They rely on men using lower brain rather than top brain when paying a deposit.