Logos is missing out on potential sales. To be completely unable to search offline books is a huge weakness in the software. If the books are available offline, they should be able to be searched offline. After all, isn't the ability to do word or file searches one of the most basic functions of a computer?
The church I attend has no cell or Wi-Fi service in the sanctuary. And, if I'm in the mountains to find time alone with the Lord, I'd like to be able to search my offline books. Wouldn't you? 
Apart from this glaring weakness, I'm still a devoted Logos user for nearly 20 years. I hope this is a fix that will be implemented soon.
<Dan>