Buyers Market - New homes in Washington, IL

So, I spent 2 hours over in Washington doing the open house thing. It's a buyers market for sure. I couldn't believe how fast they talked about doing extra things like finishing the bsmt if you had a good offer. One builder (had a whole subdivision) was offering to take your house on a trade. I though that was interesting. My understanding, they want full price on the new house and will give you full price or extra on your current house. It keeps prices in the subdivision high and they can sell your old house at cost. With 5-6 vacant houses and more partly finished I think they are eating lots of interest on the project.