Hey, I had fun working for the 87,535 IP in the runes I have and the 43,950 in champions I unlocked with IP.
Not counted in this are the champions I bought with RP. The $50 I spent on the two champion bundles gave me 40 champions, 93,620 IP worth if purchased outside of these two bundles while a few were purchased with RP individually, though often included in skin bundles (since I did get a few skins).
So even after I spent over $100 unlocking content I still had to work towards the 131,485 IP I've spent so far unlocking the rest.... possibly more considering the runes I first bought then later recombined once game changes rendered them useless by way of nerfing or providing better options.