I know you are a serious Steem app developer, which is something I generally support. I therefore believe that you deserve an explanation why I am downvoting this and why I will likely continue to downvote these posts (though I don't automate voting currently, so it will generally depend on whether I happen to see one when I have downvote power available)

1. I believe SPS is the primary intended and appropriate vehicle for ongoing project funding post HF21. If SPS voters do not decide to fund your project, to me it indicates a strong signal that your project in its present form is not deemed worthy of funding by the consensus of Steem stakeholders. The ability to, without broad consensus approval, nevertheless extract an income stream of rewards by posts and self-upvotes, potentially bought votes, friend votes, etc. is more of an exploit than a benefit, in my view, and makes this an appropriate use of downvotes.
2. When I downvoted, the post had a pending payout of about $50, or $25 after curation. Your web site is no doubt useful to some in the community and from what I have seen is definitely quality work, but funding it from rewards contributes only, at best, in a very limited and indirect way to Steem's urgent priorities of growth, onboarding, maintaining and growing the value of the Steem token, etc. In Steem's current precarious financial state, $750/month is a high cost for the platform/community budget to subsidize one of several dashboard/explorer type web sites. The stated plan to make such posts daily is excessive, at least at this reward level. Occasional developer posts which report on noteworthy releases or milestones, as others have done, is less problematic than the stated plan here of routine daily posts.
3. I wish you the best and I hope you can find a sustainable business model. Perhaps that could include a small user fee as you suggest, on-site advertisements, etc., or even possibly (hopefully temporarily) disabling some of the most resource-intensive features so the hosting cost can be reduced during this challenging period.

It is truly unfortunate that Steem is in the state that it is, in terms of price and therefore available resources (and further, at constant imminent risk of additional highly catastrophic price declines), but that only makes it even more critical that every single payout, particularly larger ones, be highly scrutinized to ensure they are extremely beneficial uses of very limited resources.