Average OF model makes less than $200 per month so I agree. (average model’s subscribers = 21, Average monthly rate = $7.20, OnlyFans keeps 20% profits).
However, when you look at where you CAN get to, the investment could be considered worthwhile, if you think it will increase subscriber count.
Someone in the top 1% of OF models (on income basis) can make over $6K per month
Someone in the top 0.1% makes over $100K per month (but thats like… literally Cardi B, Mia Khalifia, etc so good luck)
Billboards in the cheaper ranges are $2K -$6K, but can go to $20K/month in dense urban areas.