Hey Phyllis,
I think the question of which advertisements to show, and
when, is a bit of a balancing act between a number of factors. Basically, all
you really care about as a media owner is your revenue per page impression and
your number of page impressions - so your looking for a setup that
maximises both...
... the first thing is to strike a balance in terms of the
number of advertisements you show per page. Adding more will increase your revenue
per page impression - up to a point - but if
your website gets too ad-heavy you'll loose page impressions (bounce rate will
increase, time on site will decrease, and repeat visits will decrease, if you
get too greedy).
... secondly you can think about where your ads are
positioned and what dimensions to use. There will be lots of good research out
there on the best places to position adverts and what sizes to use. I know that
Google Adsense fanatics measure this to the nth degree. I guess your goal here
is to lift the Click Through Rate (CTR) of each ad-position as high
as you can for affiliate banners, but interestingly, the CTR doesn't impact your
bottom-line directly for advertising you sell.
... thirdly you have the question of which adverts to show. Again,
the aim would be to maximise your revenue per impression for any given advertising space. If you, say, sell your
advertising space on a CPM (cost per 1000 impressions basis), and show affiliate banners, this is fairly easy to figure
out (of course, these are just two options, there are others)...
... revenue per impression for advertising you sell on a CPM
basis would = cost of the advert / 1000. Revenue per impression for affiliate banners
would = revenue received / total page impressions. You could solve this problem by cycling your banners (show them alternately), then compare the results (£ / impression), and show the
winning adverts. Again, your goal will be to charge the highest CPM you can get for your inventory.
This is basically an ad-serving problem, and you can get
software to help you with this (for example OpenX - which a free adserver)
Very interesting that most of your profit is coming from credit
card banners - maybe you could consider setting up a website that keeps people abreast
of the best deals on credit? Then you could collect leads, and build a mailing
list, which is another nice tangible asset to own...
Cheers,
Niki