How much should this worth on my site ?

Hi friends,
I am not sure if I am posting in the right place, mods, I am sorry if this is the wrong place
Yesterday I got an offer from one affiliate site regarding some banners they are offering me to place on my website. I think it is related to some live tv streaming application which allows users to watch more than 4k channels on their PCs or Lappy. They are also offering some movie based programs too which allows its subscribers to download unlimited movies, games etc.
This affiliate site says that its a one time subscription and the moment any single subscription sale is made, I will be benefited with 75% flat commission rate.
My question here is, does this worth it ?
Should I also charge this site for posting their site banner on my weblog ?
I am a little confused here and has not yet taken such offers. […]

See original post by China_girl