If you run to someone, you go to them for help or to tell them something. If you were at a party and somebody was getting high, you didn't go running to a cop
If you cannot run to a particular item, you cannot afford to buy it or pay for it. If you can't run to champagne, buy sparkling wine. = afford
If something runs to a particular amount or size, it is that amount or size. The finished manuscript ran to the best part of fifty double-sided pages