Wow the prices certainly have changed. I just had mine installed this past week and I paid over $9k installed (tax included). I live on an island, so the delivery and installation costs were a bit higher than if you live on the mainland. The ferry fee alone is over $200.
This is my 3rd lift, the first lift I installed was a Mohawk 10A (that was a beast), but it was purchased along with the house when we sold that a long time ago. I have been using a Werner SRM and still have it, it has been moved 3 times without any issues.
This is a new shop build on an island I already mentioned in WA state and the dealer came from just south of Portland, OR so I feel that their installation costs were certainly justified. Overall I am happy.