Sellers Obligation To Respond

For the second time in a week, I have had sellers not respond to my offers. Listing items for sale is a right that comes with obligations. By the very nature of this forum, and others, there will be more lookers than buyers. That's how it is in the real world as well. At a minimum sellers need to respond to e-mail inquiries. They don't need to answerer at length. But common courtesy dictates that, at a minimum, an acknowledgement of some kind be provided; a "yes", "no", "sold”,” if after I answer all your questions, are you prepared to buy". This is an e-mail based forum, so responding in e-mail is the correct method. If people are not prepared to respond to e-mails (buyers too) don't use this forum. Harsh but frustrating.