doesn't seem like this sale was fully first come first served. Congrats lucky winners!
i dont think people realise quite how many people enter at the exact same second, or account for the time it takes for the email to arrive, especially given the amount coming in at once
also of note, is lets say your email arrives 5th, but what you select has already been taken in the first 4 emails, it doesnt matter if you are 5th, you get nothing but many people behind you can still get in who selected more choices
the key to sales like this is
select every option, and list them in preference order first to last
work out the delay between sending an email and it arriving to somewhere close in location to the person running the sale
send it to arrive exactly on the second of the sale
get very lucky because a ton of other people are doing exactly that
id also reccomend not using a hotmail account, as this seems to take much longer between clicking send, and it arriving
this stuff wont guarantee you entry, but not doing any of these steps, will drastically decrease your chances