Is $1.5 million for a website a legitimate price? It seems extremely pricy to me, who has literally no experience in website design. I mean, unless it's like a site for Microsoft or something I can't imagine spending that much for a website.
Also, $100,000 a month to a company that no one really knows anything about? It just seems strange, to myself, a total outsider.
You should split those 1'500'000 dollars to all the slickage team (~10 person) and you will see that it is not a lot of money ... ~150'000 dollars to each component of the team for a 1-2 years of work (and maybe they will receive more money, who knows?).
10 persons? AFAIK they are just 4 developers and they were supposed to complete the job in 1 year - so you could bet they will charge more for a 2 years job.
Furthermore, could anyone show us a track record for Slickage? Any previous work done by its founders?