Iron Depot is such a great QOL upgrade and well worth the gold. It makes a point to mention that by purchasing it, the iron and nails you would see while exploring do not show up anymore, increasing your chances at the other drops.
My proposal would be a simple behind the scenes improvement to everyone's gameplay by doing the same with pets. I have iron Depot and watch iron get voided every single hour because I got the green python.
Increase my chances at something else please!