Professional photographers can and do pay models when/if they are working through a 3rd party on a specific product in which the photographer is paid (and the model either compensated by the photographer or the 3rd party). Internet models tend to think that paying for photos is unnecessary or completely undesirable.
What happens after 10k followers on Instagram?
Once you have 10k followers, Instagram will make it easier for you to get people to your website via Stories with the swipe up to link feature. Swipe up is the only way to get a direct link from your Instagram to your other web properties. And, it’s available in STORIES, if you have 10k followers.