Which is exactly why there are so many of us in the forum loudly advocating for Zcash protocol controllers to introduce a fee market, rather than keeping the essentially free minimum rate of today.
The only way to make The Zcash SAFE well funded on a long timeline is to introduce a fee market.
Sending in an variable $5-10 or even $50-100 a day into the development and grants funding treasury of the future is not enough to assure long term liquidity.
Re: Assumptions
Supposing Zcash reaches only 20% of the current Bitcoin fees paid level of today, and that Zcash SAFE absorbs ~5% of the the daily fee average, that would imply $5,000 collected per day.
Fees paid for usage is an explicit demonstration of value!
Without a fee market, Zcash users are never going to have the chance to show the value they perceive in using ZEC.