You just wonder what is the true cost to attend an interview?
Travel could well be a staff ticket, paying only the taxes.
Yes, there is the cost of HOTAC, but to be charged for the interview process / sim check is not something which quality employers do.
You need to visit to assess the opportunity on offer, but it will clearly discourage those who have no inside information. If the employer is confident that what is on offer is attractive, then why charge if you decline their kind offer?
They are either at it [beancounters at work], or the grass is definitely not greener once you see the place for yourself.
Initial meetings/interviews in your own country might be one way to do it?