Like you, I've got plans for other bits of the car at the moment. If I had 'spare' money lying around I'd splash out but can do quite a lot with the current bid price of that plate and get considerable more enjoyment ouf of it.
Also, mate of mine got pulled for "incorrect representation of the number plate" and the Plod lectured him etc etc. Only way to fully benefit from that plate is to do same and in time there'll be enough things for Plod to stop me for (neons, blue LEDs, already got blue lights in) without having excuse of number plate.
If only I had £500 spare. Anyone fancy chipping in for me!