The broads I think could do with a lot more electricty points with modern boats having more and more electric gadgets, and particually those who like to cruise in winter and need to leave heating on all night. I know personally I can get by on 50-60p per night which I think is very reasonable.
Now how to fund them, surely it would not be that difficult to fit in the electronics a device that notes the time when the card is inserted, bearing in mind all broads authority moorings are 24 hours, and exactly 24 hours later reset the point to zero, hey presto with a lot of people they would gain all the left over credit to help pay for the posts. This would also put a stop to those who cruise the broads going from mooring to mooring using the accrued "free Credit",