Is making an AD worth it in BBS

It's a great subject to educated the community on 

who should put ads ? technically both users and admins 

but who can benefit more 

If i was a board owner i might, but remember that you have to pay with adsense to make Ads

And taking in consideration how rare is to get an AdSense now  around 6 good posts for 1 AdSense

I would really think twice to put an Ad 

What do you think 

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