When I read your description I wanted to run to the window, throw up the sash as hard and I can, lean back to take a very deep breath and then stick my head out and yell.... WOOOOHOOOOOOO! Way to go Risa! Yowwwieee!
It sounds like your content is really really successful.
I don't think that you should be disappointed if most of the people leave. Some of them might "like" your page... some of them might "tweet" about it... some might even "link" from their blog...
These can be beneficial to the rest of your site.
If you have best-on-the-web content for these subjects then those things should happen at least occasionally. And those actions should help the rankings of your site and perhaps set your site in the memory of a few visitors. I think that building great content just for these benefits can be worthwhile.
Let's consider the value of these pages....
Can you say for a fact that these pages result in zero sales? Zero? Have you tried tracking a visitor from these pages and into your shopping cart?
If you are getting just one sale per month from these information pages think about the math. If you make $20 profit per sale and these pages are up for five years then they will yield $1200 in profit. So, if you spent 12 hours on that article it will make you $100/hour.
These pages are just like zero cost sales staff. If you had a jewelry store in the mall, how many people would walk through, take a little bit of your time and walk out without buying? But those people might come back if you make a good impression. Those people might come through looking at rings many many times and then finally stop and buy one. Each visit required a little bit of your time to greet them... but they bought nothing.
Then add the link, like, tweet, share benefit and that page is really valuable.
Also, if these pages are not getting people to your sales pages maybe it has something to do with the presentation.... You say... "I have links to those products".... OK... but maybe you need an image... with a sales pitch..... "Get one of these!
The presentation can make all of the difference. Something else that can make a difference is the items that you are offering for sale and their price. Maybe if you had less expensive items you would sell more? Maybe if you had a book for sale the information hounds visiting your site would buy it? Lots of variables to consider.
You said that the adsense "worked against you"... Did that mean that your sales dropped? That means these pages were yielding some sales. Also, if the adsense didn't earn much it could be the color or the format or the placement.
" It's clouding my statistics. "
The statistics from info pages are very different from those of retail pages.... but those statistics can be very valuable.... but who cares about them, really.
I understand that you need to make an economic decision... before you do that consider the long term value of these content pages and the overall impact that they might have on your rankings and the stature and reputation of your site. Also, ask if you can do anything different that will steer these people to buying pages or present the ads in a way that elicits clicks.
What has the trajectory of your site been? Is traffic growing? Are sales growing? If the answer is "yes" then maybe you are on the right track... if no, or the rate of growth is very very slow then maybe you are just in a slow niche.
I've rambled a lot but really the answer to the questions you ask are hard to give. It is very possible that you are in a niche with such a low sales volume that the articles are not worth the time... but this same approach might work well in a different niche.
Without detailed information and knowledge about your topics its hard to say "yes" or "no".
You have been successful... but maybe missing one piece to the puzzle of getting nice sales.