When will you stop upgrading?

tyleerxo wrote:
So is upgrading definitely the way forward? I'm confused on what to do as I feel like I'm never going to be able to craft anything.

yes, keep at it. I think it's a delayed gratification thing to keep people playing and also to entice them to spend donuts. If you're playing regularly and have a decent number of characters, I think you should be fine at the end.