I might be able to put some information together as I go along. I love the collections and have gathered many already, so I am familiar with where some of the spawn points are, and a rough idea of the percentage of drops in a zone for some of the common collectibles...
I've only been playing this game for about 6 weeks, so I'm doing a ton of exploring and I might as well record some of the information as I go along. But as for putting that info in an add-on... I'd have to research that.
Ok, I'll start collecting info and then I will probably post again in a week or so and see if I have enough to get started on some kind of rudimentary add-on.
Thanks for the advice!