To work with a new PPS site, you have to find some sites with the same kind of resources and form an alliance.
If you don't like that, you can sperate your site into multiple sites with different topics instead of put everything in one site.
And don't forget to link those sites each other.
Users don't want to buy premium accounts just for one site, even it's very big.
Most of them want to buy one premium account so that they can download from multiple sites.
You have to let them know you're not the only one who are using FileRose.