I dunno about getting a a few thousand for them ... usually, it's going to be the other way around, in which it would cost you a few thousand for them to remove it, as they need to bring in excavators and provide you back some fill dirt.
The corollary is that they get to make money on both sides ... from you to dig it up and from a client who wants to buy one.
That said, from time to time I have seen palm trees listed on craigslist ... doesn't always sell right away, but eventually there are takers.