It's been done for like 6 years and those actors havent been in much since. Seems like a (prudent) move on their part to make get some more out of it while they can.
They earned so much during the show that they don't actually need to get some more out. Plus, some actors has had successful ventures after The Office like Krasinsky and Fischer.
Following Fischer and Kinsey on social media it seems they really love the love of their fans.
These two are best friends, if someone paid you and your best friend a gigantic bag of money you saying you wouldn't talk about trivial shit from ten years ago weekly?
They earned so much during the show that they don't actually need to get some more out. Plus, some actors has had successful ventures after The Office like Krasinsky and Fischer.
Following Fischer and Kinsey on social media it seems they really love the love of their fans.