Hello!
Thanks for your feedback.
As a matter of a fact I can’t know who would buy any of these domains. However, their areas of subject are not entirely outsiders as far as the web is concerned. For ByTalks I think the social network area would be interesting (talk, conversation, chat, relationships, tweeting, etc). For Manwards I think that many human related areas could be a possibility, such as social sciences, humanitarian, humanism and even social networking as well.
As for the “s” it does hinder the domains a little bit. But the sale price for ByTalk is many times higher than the first bit I’m asking and I think this plural is quite brandable. I couldn’t find the sale information for Manward.