Is there currently a way to tell how much isn't too much to pay influencers or to know what others have paid? I have seen Instagram-famous with 250k followers a

Is there currently a way to tell how much isn't too much to pay influencers or to know what others have paid? I have seen Instagram-famous with 250k followers asking for $5k for one single post in their demographic- but after calculating the ROI with many guess work and assumptions, it seems to be a lot worse than FB ad. The influencers often pitches themselves to be more "organic", or the ad is giving more "brand" effect that's hard to measure with traditional metrics. Sometimes this just feel like a new way of gambling and the seller has way more information and leverage than the buyer.