Yeah, it’s exactly the same in the very opposite end of Europe (and about as poor) - Portugal - which I know becaused I maned the polling places a couple of times and read the rule book.
People generally do it because they’re in a political party, plus you get paid for it though I think it takes many months for it to come in (never really worried enough about it to keep an eye out for that money coming into my bank account) and it doesn’t add up to much per hour for what’s a really long day (from about 6 AM to around 10 - 12PM depending on how long it takes to count the votes of one’s polling station).
It’s an interesting experience if a bit tiring.