Wriging

Define "pay".

Define "worthwhile".

If you have 5 visitors a day, every 50 days you might get a click, for $0.30. If that's worthwhile then 5 visitors a day is your answer.

If you have 50,000 visitors a day and you're netting 5,000 clicks, then $150 a day could be yours and there's your answer.

I've seen blogs without much traffic do well financially through CPA programmes because their readers were after specific information and the advertising suited that nicely.

Other sites that have lots of traffic but only run a small CPC network like Google Adsense have been known to make very little, it's really different horses for different courses.

By your numbers, you suggesting a 10% click-through rate. Tad high, no?

I know it's not impossible but I get a 1.8% CTR.

It depends on the niche, the type of ads and the traffic. I've known some niches to have small loyal audiences and make considerable money (because those users purchase the advertiser's product). I know many sites that have more inventory than they can sell and make almost nothing. If you have a new blog with little traffic it's not worth it.

@Oli - yeah, that click-through is not the norm.

IMHO if you have to ask the question, you probably don't have enough traffic...

Mmmm yeah my maths wasn't ideal but you get my point.

@subimage
you're probably right :)

if you have to ask the question, you probably don't have enough traffic...

Alternatively ... if you have what Seopher would call a high conversion rate it wouldn't really matter what your traffic was. But what kind of ads would have an uber high conversion rate beats me.