You can comfortably sell a $10k IT solution with a $50 lead. What matters isn't the lead price but how you work with it.
Lead + qualification + meeting
Actually, we got these leads at $3.7. But the point isn't the cheap lead: we call the leads delivered to our clients ourselves, and book a meeting only for those who are clearly going to buy.
That is, we deliver not the lead itself but a qualified, meeting-ready customer. For this we also provide a call-center service as an add-on — filling the link between advertising and sales.
Conclusion
A cheap lead alone delivers no result — only when qualified and prepared for sale does it turn into a $10k sale. Look not at the lead price but at the completeness of the process.