Not true. As an example, to send a small package (500g or 17.64 oz or less) from the USA to Germany via the USPS it cost $17.91 via their International First Class Mail service.
However to send the same weight package (500g or 17.64oz or less) the other direction, from Germany to the USA via the Deutsche Post, that only costs 3,45 Euro ($3.72 at today's exchange rate).
As another example, to send that same small package with "Registered Mail" it costs $13.95 extra from the USA to Germany via the USPS. Going the other way, the same package sent as "Registered Mail" ("Einschreiben") cost only 2,15 Euro extra ($2.32 at today's exchange rate) via the Deutsche Post.
Not sure how the German Deutsche Post is able to deliver their mail to the USA at more than 5 time less cost than it takes for the US Postal Service to deliver the mail to Germany....somehow the Deutsche Post seems to be able to stay in business despite their good value shipping rates!
Keeping with the required Model A forum theme, this is obviously a USPS truck - no funding for maintanance!

(MAFCA web page photo)
Thank you Stewart for saving this truck with privatized funding
Fordially,
Brad in Germany