If it was with just the girl running it, I can understand her asking these high prices since OF has pushed prices much higher than it used to be. It usually isnt worth their time because they can make a video, slap a price on it and probably make at least what a custom is worth if they have any kind of audience. There are also those that do have to limit them because as it is, custom videos typically are very specific and you would be surprised some of the shit people request in them. This one girl opened up customs recently and shut it down within a day because of how bizarre some of the requests were, and she was willing to do some wild stuff so the unhinged have also caused girls to make it worth it to them. I know that is relative to some but its hard to resell what is often a niche market that most will balk at.
Then you have girls that genuinely like to make custom videos and that is mostly all they do. Its hard to find them but they are out there, it just wont be on demand like it once was.
Agency run pages and customs are either going to be prohibitively expensive or a complete scam. I still lean towards scam myself because look at how when you are having to talk to them, the point is the girl doesnt even have to get involved. Maybe only the ones that do actively work with the girl might be worth it if you are simping that hard, but most of the time, these guys on the other end of the screen are just there to follow the script, make a few bucks and dont give a fuck what you actually want. And you have to remember you arent actually talking to her at all if ever anymore. "She" doesnt answer messages, so when these dudes on the other end of the screen always say yes to what you want, unless its illegal and they can interpret it, its hard to get a no from them. The only noticeable things they always say no to are things they cant add to a video thats already made, and they will also suggest what they say they will do because that is what is in their vault already that hasnt been released yet. I cant say they are all like that because there are so many agencies and so many girls out there and they all have their own way of doing it, but see anything enough times and it starts to point to suspicion. Just my 2 cents anyway