Ebay is a good way to offload cards, although the "value" you get is sometimes questionable. For example, the Future Enterprise can sell for anything from £20 to £40 depending who is watching/buying, but then you might buy 1,000 cards for £12 and get 2 of them (i've recently won a bid for 1,000+ cards for £22, and the only reason I went this high is because I could see a small stack of cards which i have hardly any from that set!).
Bulk sales will sell the cards quicker, and will get more people at least watching, but you will get less in return. I have tried to sell stacks of 200 randoms starting at £2, but had no interest at all - yet a friend sold half-a-dozen 3/4 card lots for £1-2 each, simply because the buyers could see the cards.
If you know your cards, it might be worth splitting them into lots of 3/4 Rares, and start these listed at £1 or some similar value. You again will be unlikely to get their full "value" but will get more from a sizable collection than either blind-bulk sales, or holding on to them for a "rainy day" - because as people have said, they are unlikely to increase in price.
Depending what you have... I might even be interested!! :¬D