Biglion and apartment with 90% discount

Now I received a letter from Biglion. Offer an apartment with a discount of 90%. The opinion of the habrasoobshchestvo on this subject is interesting in the light of some events connected with it.

So, here is the text of the letter:

On August 1, 2011, a campaign called “Apartment in your city with a 90% discount” starts, within the framework of which each of you will have the opportunity to purchase an apartment on favorable terms.
Every registered user with a completed profile can take part.
Attention! The number of apartments is limited, do not miss your chance to become the owner of your own property at a bargain price.

Proof-link .

What do you think?
- discounts are unreal, it means somewhere deceived;
- even if you attract a bunch of people to buy apartments at 10% of their value, how to sell them. Indeed, in this case, an increase in the volume with such a radical (by 90%) decrease in the cost of profit will not;
- how such a deal will be made out later is a big question;
- Biglion has already been seen in dishonesty , which leads to certain thoughts.

Interested in the opinion of the habrasoobshchestva, how this scheme works and how legal it is.
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UPD. During the discussion, we found out that this is a lottery, as with the Ford Focus .