Sites Being Indexed in Google then Deindexed Immediately

Dear Warriors

I've been very busy creating affiliate mini-sites (5-6 pages) for physical products in the last few days, my first attempts. I usually concentrate on my own products, but I thought I would give physical products a go for a while.

I created one site a few days ago. I started an Adwords campaign and submitted the site via Social Marker.

It made it's debut in Google at number 5 overnight. I was ecstatic. I even made a sale. I was dreaming of gold houses and rocket cars.

By the same time the next day, it had disappeared from the index doing a site:mysite.com search. I was so sad. I felt like I had lost a friend. I could no longer revel in its success.

With a bit of an effort, I soldiered on. I started another site. I toned down my linking and bolding. I didn't submit to anyone. I made a real effort to ensure it didn't look like I was trying to game the search engines. This morning after submitting my Adwords campaign, it appeared in Google at number 6. This afternoon it was gone from the index as well.

Is this just normal with a new site? Can I just soldier on and not go and drown my sorrows somewhere? Because right now I feel utterly dejected. There's quite a bit of original content in them. I'm pretty conversant with SEO so thought they were optimised quite well and naturally. They are not linked to from anywhere, except bookmarking.

I was working on 2 other affiliate sites, but have stopped. What is the point of all this work if they are going to be deindexed immediately?

Is it normal for new sites to appear and disappear? If not, what I am doing wrong for this to happen?