Okay, that's an entirely separate discussion. You posted an event of you submitting a new image, which you said you had set as a public custom, and the page I linked (or that part of whatever page you submitted an image for) is where it would display. That's the 250 CP deduction. Applying a custom only costs 100 CPs.
If your question hasn't been answered by now, you'll need to be more clear about what you're asking, because repeating the same information over and over clearly isn't doing the trick.