I hate how

On any trading forum for video games, about half of the people trading say in the post 'if I don't respond I didn't like the offer' or something similar.

Like how am I supposed to know if you even saw the offer, its so annoying when they do that bc I dm them. Also, it means that Idk if I should make another offer, cz maybe they just havent seen it yet and I'll be wasting my time typing other offers.