I'd love to give it a try, but a 25% fee will keep me from regularly​ using it. Unless a Steem front end is far superior to Steemit, I wouldn't want to use in lieu of Steemit if they're charging more than 5%.

If Viper were mine, I'd take no fee until it got really popular. Up until that point, I'd fund development by starting a Viper witness and by posting development updates on Steem.

Once I had a ton of people using Viper, and it either filled a niche or was just a much better experience than Steemit, then and only then would I start charging a fee. That fee wouldn't be more than 5%.

I've been in online retail for quite some time and have sold on many online marketplaces. I've seen a lot of marketplaces pop up over the years, and sellers will only use them if they have low or no fees. If the marketplace tries to start off with high fees, they never go anywhere.

I've seen some marketplaces become successful, but they did so by way of volume, not high fees. Discogs, for example, have raised their fees over the years and are now massively successful. However, even today they only charge 8%. They became successful by having low fees, a user-friendly interface, and outstanding SEO.