Cost Differences

It's odd, the way flights are priced, depending on where your starting point is. To go from the US to London is over $1000, but to go from London to the US, it's under $600.
Mind, this is round trip, and economy class.
But either way, it's shocking, and just that little bit unfair. Makes it just that little bit harder for someone to travel.
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It's interesting, and just that little bit disconcerting, watching a relationship from the outside, looking in. Watching it, pull apart, ever so slowly, like taffy being pulled, stretched too far.
I am a Watson in a Holmes/Watson friendship, and I am watching it fall apart. Holmes has gotten too caught up in his case, and has left Watson in the fog choked allies of London. Would--should?--Watson follow, or turn home?
And the real clencher--does Holmes realize he's left Watson behind?