Ask HN: revenue sharing model digital publishing tool/platform a good idea?

We are currently building a digital publishing platform sort of in the vein of onswipe/adobe DPS, it's a set of tools that help publishers to create apps for their contents (books, magazine or newspaper, think "our choice" kind of publication) that run on iOS/Android tablets and phones.

Most vendors in this sector are charing monthly platform fees and per download fee (take DPS for example, it's $0.3 for each download of the issue).

We are considering a revenue-sharing model that publishers just need to pay a one-time setup fee, then we will split the revenue, be it by selling of each issue, or advertisement.

Do you think this is a good/viable idea ? thanks.