If you think you will get some profit by buying nodes on a pre-sale, I think you will have a bad time. Here is why:

1st There is no exchange available and who knows when will it be. Good luck selling those coins on peer 2 peer, you will have to compete the devs for that. And getting 2 coins per block, will take a while to stack 10k
2nd You probably have no idea how many nodes will be sold on the pre-sale. They have a premined equivalent to 308 they intend to sell. And drop a few coins as bounties.
3rd Block reward at this point is 2 FIX / block. There will be another 18 hours or so, maybe more until you will get decent rewards for nodes.

I really think you should see this before rushing to buy a node... There are already 22 nodes up and counting.