I have 2 sites that promote satellite tv (dish and direct) and one for satellite internet.
The plus side is that you can get into the traffic fairly easy with
seo if you are good at it and the traffic is plentiful, the downside is the conversion rates.
On my sites I average a 7.19 % CTR, so the traffic is clicking through, but the actual conversion rates are sorry, at best! This is not just one company I do this for, so it is not just a bad company, as I have went through several.
Now, on average of 5 k clicks on affiliate links per month ( clicks to merchant sites), I average only 8 to 12 conversions per month.
It is all top quality traffic and keyword specific and this has been the results no matter what affiliate program I have used.