I would do a search for job listings that would be the jobs you would be applying for if you chose to leave your job or were laid off. Do the job descriptions list the certifications you are thinking about getting? If so, it might be worth pursuing, especially if you can get your current employer to pay for it.
For example, almost every project manager job lists PMP certification. If you are currently a PM and don't have it, you might want it just in case you get laid off to improve your chances of getting a new job. Otherwise, you might be up against 10 other candidates with just as much experience, but 3 of them have a cert and you don't even get a screening interview.
The way I've seen it, it appears to primarily be used by the various British and former British colonies, including the US. For these groups, anyone from outside the colonies living in "our" territory is an immigrant (who is certainly a lower class!). However, if we choose to reside in another country, we are not immigrants, we are "expats".
Not everyone uses this term, but those that do frequently congregate in English speaking enclaves and make no attempt to integrate into their new home. They often see the locals as a sort of servant class, particularly because they probably came with enough money or income to make them wealthy by local standards.
As you might imagine, people with this attitude are probably not very popular with locals.