The idea of earning bitcoin by uploading your files isn't entirely new, some of them can be found in this forum such as gag buzz in the past. But this is the first time LN is applied to such services.
Will you apply any fee for uploading/downloading, or are you planning post an advertisement on your site?
There is a fee of ~1$ for the seller if he wants to withdraw his coins and a ~0.3$ fee for the buyer per GB downloaded.