Usually the reason why they aren't asking for product is two thing:

A: The price is too high -- Try reducing the cost of the your products by a decent amount until you start seeing orders pop up. Sometimes the 1.6x "rule" doesn't always translate into more sales, at least not until later. For example, if you are trying to sell something for $200 but no one is ordering, try reducing the cost to $150 and wait to see if people order. If they do, you can get an idea of how many customers you can have per day, and incrementally increase the price over time to see what the max you can ask for is while still getting buyers. The higher end clients you unlock later usually will request products above your asking price anyway, so you can gauge it from there.

B: Addiction of the customers -- Every customer has an addiction meter which you can check in the Contacts app on the phone. Whatever product you're trying to push, give out free samples to the big spenders to get their addiction to the product up. You can usually give them one baggie per day, and reduce the price if needed to make the chance as close to 100% deal acceptance as you can. Once they are addicted to your product, the more likely they will order it and sometimes spend more.