I am in UK, and often see them out with their carts. Not once have I seen anyone remotely interested as they walk by. Once there was an old friend of mine who is an elder with a sister, and he looked so miserable His whole body language was saying I really dont want to be here. I called over to him to say hi, and in fact I had to call him a second time before he eventually woke up from his little world and said a reluctant hi back to me.
Most times when I see the JWs with their carts they are playing with their phones, so not even looking at passing people.