The fact they attended the meeting already shows they are interested. What maintained that interest to the end is as you say a many forked answer and what they tell you and what they are actually thinking will be different.

They may have your company in mind to work with another company they know/own down the line, or the other way around and with that, see which one works well and breakup the other. That they won't outline at the start and yet would be a reason of interest in buying.