Other time zones and that makes communication difficult, so no quick IM with "by the end of the day" as that means something different over there. Different culture and way of doing things, so have to spend a lot more effort in communication being very clear. Even then they're far away where it's a lot easier to hide stuff until the hole is very deep. Travel expenses going up very quickly for a little training for a new guy. It can be so fun to work with teams in a different continent.
Recently the boss asked since guy why he doesn’t put in more effort for the end of year evaluation and a promotion. Guy opens a spreadsheet that he’d been working on. It basically shows that even when he’d double his wage in that promotion, he still would not be able to afford a house and felt striving for a promotion in those circumstances didn’t matter much. The boss left.