I think I hate Invention 10x more than I do Dung & that's saying something because I thought I was going to die getting Dung to 75 just to have access to Priff. It's still only at 75 & I see no future where I train it more than that right now lol.
It's just really hard to get the actually components you need out of items without spending a lot of money. Maybe I'm doing it wrong but I buy high-ish tiered items for the components needed and still sometimes 400-600 items in and I still haven't gotten all the components needed.