Changed name to distinguish it from price adjuster

This code should be run no less than once an hour per item ideally

I think it should be once every 10-15 mins per item so there's a
potential for 40p-60p change per hour and £9.20-£14.40 per day

realistically given the random nature of the code I doubt such dramatic
changes over 24 hours unless there are huge changes of real life data,
due to in game forces