AidenShaw is right and I agree with his statement on the matter (and that say something since I usually don't agree!). The pre-release seeds are not intended for public consumption regardless of your intention to get Snow Leopard. Your up to date purchase was for an operating system that is going to be sold to you in September. It does not grant you any access to development builds in any way. By downloading these builds without permission from Apple, you are depriving them of their right under copyright to restrict its availability to the public.
The pre-releases are intended to their paid select developers. If you did not get it from that program you are in fact stealing. Apple did not grant you access to those files. They are not available to the public. It doesn't matter how much you want it, but Apple does not test their OS like Microsoft does - Apple does it privately.
And there
is theft going on. Intellectual property can be stolen even if it is not represented in a physical form - its those laws that prevent you from downloading trials of commercial software and cracking them for prate re-distribution.
By illegitimately obtaining non-public software you are:
1) Depriving Apple of the subscription costs to be a ACD member (which they are entitled to ask for)
2) Depriving Apple of their right to control distribution of their intellectual property (again which they are entitled to do).
You may not be going into an Apple store and doing a 5 finger discount on (say) Leopard, but its the same thing. You are depriving something from a property holder. You do not yet possess the necessary usage license for Snow Leopard - that doesn't happen until September.
Here are the terms for the program you signed up for:
I understand that you think you paid market price, but that is irrelevant. You don't get to determine the market price for products that you do not own. That's for Apple to determine.