I find it hard to believe it would be worth the $150 as shown on that EBay listing from Happy camper, but it still did sell for that much. One thing I've learned though, is that unless you sell everything on ebay, you're not going to get as much for an item just by selling locally, like for example, Craigslist. Cast Iron can also be a very tricky item, as there are many worthless Chinese fakes made from the '80's to now. Yours looks like a good piece, plus it has good paint and nice patina.
In my opinion, the max it would be worth is $75 to $100, but it's all what that one person is willing to pay.