What you haven't yet told us is: what's the lifetime value of a customer of your service? Your stats above show an acquisition cost of $4.75 per user. That fee

What you haven't yet told us is: what's the lifetime value of a customer of your service? Your stats above show an acquisition cost of $4.75 per user. That feels a little high, but you also have to consider the "landing page vs real product" problem. You may have gotten a higher conversion rate if you had a real product launched. You also don't have any experience yet advertising your product, so we can assume that the user acquisition cost will go down because of that as well. So considering all that: what's the lifetime value of a customer? $10 or $100? If it's closer to $100, then even an acquisition cost of $5 would be great, but if you end up spending $5 to get a $10 user then either a) your idea isn't that compelling, or b) your marketing is suboptimal (edit: or c-- your product or industry demands that type of return, which probably isn't the case here). So while I don't have "the answer" for you, you should start thinking about lifetime value of a customer and what you expect your user acquisition cost to become 6 months after launch. Weigh those two against each other and you'll have a good idea of whether this is worth pursuing or not. Best of luck!