That surely is a thing on platforms but I don’t think that’s the case here. I don’t think you have new user restrictions on AS, and even if you did you don’t need to ask about purchasing to achieve that goal. You might as well just send a short generic message saying how cool my work is and how much you like it and leave it at that. There is clearly a hook in my case scenario prompting the recipient to reply, + ambiguous business, and this in turn increases the risk of someone reporting their account. Why risk it if you don’t even need a reply in the first place?