Think of a personalised reg number as a bit of fun, not as an investment and you will be able to enjoy it for what it is.
I know I have put this up before but it seems a popular topic. In Perth we pay about $500 dollars once off for personalised plates and you can almost pick what you want. you do own the plate and you can on sell it if you wish. I got mine so people stop asking me what type of car it is or how old it is. Doesn't work