I've loved using ModularGrid, thank you for this tool! It's very helpful for keeping a catalogue of my current gear as well as track gear I am not currently using in my main case.
As I recently went through the process of applying for equipment insurance, I found myself wanting MG to support private-view price adjustments -- eg. a user could see the value of a module new, but also enter custom price that they paid if it was used or DIY. This would help not only track for accounting purposes (not the most exciting use, I know), but it would provide users a truer sense of the value of what they're planning to bring to a show or on a trip. Only the logged-in user would be able to see this.
This custom info could perhaps be useful for used market analysis, but I think a privatized view would be wicked helpful.
Thanks for the consideration!