I'm not a programmer. (I used to be, but that was a time long ago, in a galaxy far away.) I don't want a toolkit, I want a product. I love using yEd, I get that the yWorks classes are well-designed and can produce excellent results. I'd be quite happy to pay US$20-US$50 for a command-line tool that takes my yEd graphs and exports them to another format. I'd be much less happy, but probably still willing, if that tool was $50-$75.
I embed my yEd-created diagrams into LaTeX (via LyX). In order to do this, I must export them to another format (usually SVG) before I produce the final output. LaTeX and LyX have the ability to call an external command to automatically convert an arbitrary file format to something usable. I can't get LaTeX or LyX to embed the yFiles components - they're open source projects and would be unable to redistribute them in a useful fashion (not to mention the JRE dependency...).
And, again, I AM NOT A JAVA PROGRAMMER. I don't want to write my own utility (it's not the $$$, it's the programming), I want a g**-d***** product to do the job I would like it to do.