A sysex librarian for $230 per year? For a small number of machines which are getting rarer and rarer? Who are your prospects? I hope you support plain .syx downloads, because at that price, you're bound to go under, and your users will want their data when that happens.

Because the competition is free. There's a free DX7 plugin (https://asb2m10.github.io/dexed/) that includes a librarian, and there's a paid one (https://www.plogue.com/products/chipsynth-ops7.html; outstanding emulation) that also has a librarian (that I have personally used on a mac).