you've been carping about that information page for a long time
Planet13, if I remember correctly, this page and your site go back many years, and were also discussed in Supporters. My opinion, I forget when, after I'd last seen the site was that you needed to work on product presentation, and also to consider price and uniqueness of your product line. I really think that that's where your site was failing at the time.
I haven't looked at the site in quite a while, and I'll try to keep this general enough that it's helpful for anyone, whether they've seen your site or not... but as I remember it, the widgets you sell were not commonly available when you started selling them. By the time of discussion, though, they'd become much more commonly available in metropolitan areas, and at prices cheaper than yours, and I think you might have been ignoring those market realities.
Additionally, as I remember, the market had become large enough that it was also becoming clearly segmented (and I'm exemplifying these examples, so they may not apply directly to you), but I was seeing the market divided among, say, well-made mass market widgets, antique collectible widgets, and faux antique widgets.
As I remember your site, you were selling well-made mass market widgets that could be used in a practical and decorative way in home and garden, but your site wasn't doing what it needed to do to make that kind of widget appealing enough to buy online. I think you needed to show
how one might use a well-made mass market widget of the type you were selling, with pictures of it around the home, in the garden, wherever.
Beyond words about history of widgets, or how yours were manufactured, I felt that you needed drop-dead-gorgeous visuals, the kind that might be shared on Pinterest, of your widgets in use... with enough descriptive text on your site to describe those pictures both to your visitors and to a semi-blind, barely intelligent but statistically-aware machine named Google. It's a tough tight-rope walk right now.
What I remember instead from your site, and from many other ecommerce sites I see having difficulty, is a grid of products, with photos that looked like "wanted" posters... serving for identification, but not expressing tactile qualities or other differentiation among the products.
Other types of products of course might have other priorities, but this is what I'm thinking you might be missing right now from your widget presentation... assuming, ie, that the price is OK. This doesn't answer your immediate question for this season, but I think that lucy24 and Wilburforce are absolutely right that you don't gain anything by annoying the user.
If it's getting your nerves that much, make it for buyer's only, or cut it in half and say they'll get get full access with purchase.
I rarely disagree with netmeg, but I do in this situation. I don't think that you are conceivably going to gain sales, which is what you want, by withholding information and offering access only after purchase. I wouldn't let emotional frustration push me anywhere near that idea.