I didn't notice parking prices since i was riding in from fort william each day, but I'd bet money it's not that high. There's parking at the north face car park (just a short ride away along the red return) which possibly has meters but again, definately not that high.
The gondola is a good deal, also when I was there they were letting day ticket holders skip the queues, I never waited more than a few minutes for a lift even though there were always daytrippers waiting, which was nice. Get there early and ride til the end though, they only carry bikes from 10.15 to 3.45 for reasons unknown, so you need to get the timing right to really get your money's worth.