IMO 58,000 is way over the top.
A bit over 1000 a month is not unreasonable IMO, I charge more than that for paid ads on my site.
But, only you can know your finances and only you can determine the value the exposure gives. It’s a bit tricky, because very few people will click on CAP ads, I mostly type in the name of a program I want to look at. The ads will remind me that I meant to look at something, and trigger me to go and have a look though, when I am done reading here. So it’s hard to measure ROI in such a situation.
So look at it as branding and see if it’s worth it to you would be my advice.
If you decide not to go with it, you will still be able to come and chat with us, and I like that change a lot.