there was a time I visited the USA two or three times a year, then it became two, then one because travelling there is such a hateful experience. Very long lines at immigration, then queuing again through more security, being x-rayed, being fingerprinterd, being treated like a criminal.
And I suspect I am lucky as I am a typical western white male and less likely to be racially profiled and thus singled out for extra attention. Last year I didn't go at all.
Total cost to the US economy just for me about $3000 per trip, so up to $9000 a year lost. And I know I am far from the only one.