Used gold carts vary in prices partially based on how much the model was worth when it was new, what features is has and what condition it's in. Golf carts used less frequently are often worth more than heavily used carts.
Unlikely passenger and commercial vehicles, golf carts don't have odometers, so it's difficult to know how much a particular model has been used. As a result, the look of the golf cart can have an affect on how much it sells for. Used golf cart dealers sometimes offer warranties for their sales, and these warranties are likely to bring the cost above that of a cart sold in as-is condition.