Is it 30% for exclusive or non exclusive images? If it is non exclusive images like offset and you can still sell from your own site or other macro sites it would already be a competitive offer in the macro world. Because most of them want exclusive images. There are of course many agencies in the market that pay 50% or more - but do they generate sales? And you can always sell direct and get 100%. Nobody really needs an agency, or do they ;)? Just one more market place in the industry, we will see how they fare. There is no lack of agencies and it will be interesting to see what they offer that is different.
I have to try something like this one day. Fantastic image!