If my math is right there is 19620 possible upgrades per stat. Last one will cost over 212k. Upgrades costing 5001 are somewhere around 2500 and upgrade costing 9501 is around 3k4 out of those 19k62. So you barely even scratched the upgrade surface ;].
I myself stopped at cost of over 12k, which is just shy above 4k upgrades done. Which means I spent like a bit over 60M on upgrades (well add 120M pre 2.0 from maxed upgrades back then). Upgrading single stat to max will cost nearly 1460M thou, so you can see how barely upgraded most of us are hehe.