DontAssociate, assuming you applied the upgrades by using the free resources on the web and not by purchasing them from Rigol, I would be very careful with this practice. As others have hinted, as a general statement people are very intolerant of folks that earn extra profit out of something absolutely free and will be very vocal about it.
Obviously that, if you purchased the options from Rigol and is selling the whole thing at a discounted price, all is well.