These will be used to “zapvertise” in your replies comments. It will be useful to be able to set a minimum threshold for when those are allowed to appear above regular comments from people. A 1-sat zapvertisement for something I may not care is spam potentially drowning out legitimate conversation, and it costs the zapvertiser virtually nothing. Allowing users to set a minimum threshold will cause zapvertisers to be more intentional and less spammy because it will cost them more.