The Zcash Foundation only donated around 121 Monero to that conference. At the time, one Monero was worth around $43, so they donated around $5,203 to the Monero Conference.
While we’re on the topic of prior expenditures, I’m much more concerned about the ECC’s May 2018 investments in Agoric and Starkware, which presumably were much larger than $5,000. Those investments were presumably made using Founders Reward coins, since the ECC does not have any “alternate revenue streams” besides the Founders Reward. Those investments, made with Founders Reward coins, should not inure to the benefit of a private for-profit company, especially one that may “wind down or pivot” depending on which choice the community makes regarding a future development fund. As a prerequisite to receiving any portion of any future development fund, the ECC should be made to divest those investments into a trust managed for the benefit of future Zcash development.