Earlier quoted context omitted.
Indeed; you can see some links in my profile. Our product is unquestionably a big-ticket, slow-moving, long-sales-cycle kind of thing. However, there were plenty of clicks. I've just never had a single sale, and only a very small handful of low-quality enquiries, despite lots of traffic.
Well that's very possibly an attribution issue. Those clicks led to traffic, and if the sales cycle is long those clicks will take months to convert. Unless you are tracking sessions back to their source months after the fact, you can't really know if those ads led to conversions or not.
This is why tracking is so important. @Parent what is a conversion to you? Maybe you should add something light that the user can do that gives you a sense of their interest other than a purchase.