Traveling is both expensive and unpleasant: my house is more comfortable than a bus or plane, and much cheaper. If people visit each other with similar frequency, then this all balances out, when someone has more time for traveling than another there are probably a lot of visits that don't happen because of how the costs are divided.
Switching to a convention where the visitee pays traveling costs would partly work, but then you're potentially in a situation where people are paying costs they don't have control over. I'm not sure this would work better than the current system. Suggestions?
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