Our fee depends on usage and when usage spiked, we decreased our fee. The current fee is pretty stable and from our current metric we should rather increase it again (which we are not doing).

Since we are more than just a bot, but with customer service, abuse monitoring and many other background things that add up, going to a 5% fee does not look doable at the moment. And while the difference between 5 and 15 percent is huge for our business, the difference between 85 and 95 percent is not that big for the customer. And we rather offer a good service that can deal with all issues that may happen, instead of a margin business that has to go wild west style on issues with'no refunds'.

We are working on calculation tools and investor focussed pages, but one thing that selling your vote has is that is it dependent of steem price and sbd price and therefor historical data is not really accurate for the future and calculations have many variables. So while we like to give our investors as much data as possible, we don't want to mislead them with fake numbers that may work with the ideal case but are completely misleading in practice.

We offer an accurate ROI for market orders, as they are SP to STEEM, but votes are SBD to SP and there ROI takes into account when you convert, how often you vote, when you vote (regarding to steem price on chain) and how good curation is. We can give metrics for past behaviour but they are not easy to normalize from all these variables.

And we are working on many projects that bring investors to steem. Giving us a few percent more allows us to fund exactly that and also work on tools that we can offer for free :) It is a tradeoff and we opt for quality!