Is the Junk Mod too expensive??

To get it to a point where it works you need to invest 6 echopogs plus 26 regular pogs and a bunch other materials. For what is essentially a Quality of live enhancement.

I understand why most players just use backpacks but it's a hassle always emptying the backpacks especially when you carry one just for junk.

It's not the unique gems that's an issue you should have enough to build this by level 50ish. It's the echo gems...