Looking for advice on a LinkedIn promotion offer

Hey everyone, I hope you're doing well! I received a LinkedIn message offering a shout-out post for $35 to help promote my project. The person claims to have solid reach and a high-quality audience across various industries, and he proposes this as a first-trial offer to gauge ROI before deciding on further collaboration. He has 77K followers. I’m curious—has anyone tried something like this before? Does it sound like a good opportunity, or should I be cautious? It seems pretty cheap. I’d love to hear your thoughts and experiences with paid shout-outs or LinkedIn promotions. 😊