Milenco Wheel Clamp New Key Price

I have one of those large yellow Milenco wheel clamps on my caravan, but unfortunately I now only have one key.  I asked my local dealer (Chichester Caravans) if they could get me a couple of spare keys.  They contacted Milenco, who said they would have to go direct to the lock manufacturer for spare keys.  This they did, and were aghast to find out the cost for two keys was a few pence under £40!!  Now, considering the cost of a new item with three keys is about £100, how can this outrageous cost be justified?

I would suggest Milenco have a word with their supplier about the costings, or change to a more customer friendly company, because I will not pay such an outrageous price.  Nor will I be buying any more Milenco products.