I've signed up to be a LinkMachine affiliate. Can I receive an affiliate commission when upgrading my own LinkMachine account?

Unfortunately the affiliate program cannot be used earn a commission on the affiliate's own account, because (seeing as the affiliate program is free to join) this would be equivalent to giving a 40% discount to every customer. You are of course welcome to give out your affiliate link to anyone else who might find LinkMachine useful; you will receive 40% of the upgrade payment for each customer who was introduced to the LinkMachine site via your affiliate link.