This strategy
may work, it seems to have done so to Blackbrook over the past year:
I've been going to Blackbrook a few years now and until 2010 there was rarely more than a couple of dozen cars in the car park, in fact during some winter visits there were only about half a dozen car loads of visitors. During January and February 2010 the entrance fee was reduced to 99p. I went during this period, during some pretty poor weather (near constant light drizzle) and the place was heaving, I'd never seen it so busy before (rain or shine), the car park was full and the cafe and gift shop were doing brisk trade -let's face it most people want a hot snack or meal at this time of year rather than a picnic.
During this period they were also giving out vouchers so that if you went in March, when prices were back to normal, you could get a free soup and sandwich at the cafe. I also visited during March, again it was busier than I'd ever seen it.
I've also visited over spring/summer and it seems the strategy has worked -the place was busy and car park bursting at the seams (luckily the place is so big that the increased numbers don't distract from the visitor experience).
I'm certain Blackbrook will have took significantly more money during January to March this year (a few visitors at full price being smaller than loads at discounted prices) than they ever had before and additionally the rest of the year seems to have had a knock-on benefit.
I'm not saying South Lakes strategy will definitely work, but a similar one seems to have done so for Blackbrook -maybe it's a sensible strategy for relatively isolated places with poor seasonal attendances?
Plus, the strategy might generate some public goodwill for South Lakes ahead of the next inevitable argument with the council

.