It is very common to see part outs on KTMTalk. More GasGas riders are starting to do it. The basic driver is the low resale value of the full bike. Parting out is not easy to do, but can return more money to the seller in the end (after everything this is sold). The process is a lot longer and shipping parts, etc.. can be a hassle.
For buyers, it is a great opportunity to pick some spare parts for our bikes. So part outs can be a really good thing... a supply of parts that normally doesn't exist at used price levels.
If you're interested in a full bike, you can always post a wanted ad with target price range that you're interested in. There are definitely used bikes available (hint, I got one too).