It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

As we all know, as we buy stuff from Vulgrim the prices go up. Anybody know if there's max to this? Farming souls in the Crucible is easy enough, so it's not actually an issue, but I'm curious.
Late answer but...

There is no price cap. It only resets if you start a NG+.