I used to have a Facebook page in 2012. In about 18 months, my likeness increased from 0 to 4,20,000 and I made a lot of money in the process, so I might be suitable to answer this question.
Here are a few things that determine your income from the Facebook page:
With lower prices on Facebook advertising platforms and greater predictability and transparency, people are now choosing Facebook ads directly, and interest in using other Facebook pages for promotions is declining. However, if you have the right audience and offers, you can still make a lot of money in this area.
I hope this helps!