Personally I NEVER look at FB ads, and Etsy's ads are inefficient from what I've heard. You might be better off going to blogs and websites and buying a month's advertisement in their sidebar, or requesting reviews or sponsoring giveaways.
Also, 6 sales from the end of November is really very good! You've not been selling for long so you can't expect sales to just materialise. Off-site advertisement is SO important.
You might also want to set up an advertising budget so you don't spend more than you can afford.
Are you a good blogger? If you are, you could always request to be a guest poster somewhere, that can always help, as long as you don't mention your shop yourself, you might want the blog host to do that for you, or it might make you seem too desperate.
Personally, I don't pay for advertising. I have a blog with my mini Etsy on the sidebar. I try to post interesting content - craft tutorials, interviews, features etc - to draw people in, and it's been working. I have a twitter and a FB and what I've learnt from these is that it's important to be yourself, not just a shop owner. Once people see who you are and get to know you it can generate more sales. I made some purchases from people on Etsy almost purely because I like them as people, and because now I can see the real value in their work because of it.
Also post interesting links for other people to retweet or share. Things you're interested in. I make jewellery, but I am a huge animal lover, I also love stationary and science, so I share links relevant to those interests as well. It does help.
Also do take into account what Marcia has said. She has some very good and important points that everyone can learn from regardless of number of sales.
But, the bottom line is that it seems as though you're doing quite well. So, to answer your origianl question, I would say yes, you're being a little bit unrealistic. Don't expect the world. I'm jealous of you as it is, I've never made more than about 2 or 3 sales in a single month. So don't put yourself down. It makes the rest of us feel bad! :P
...sorry for the wall of text. It's becoming a bit of a habit for me now ^^'