I'm pretty upset that they discontinued Sonar products. I purchased Sonar Artist last year on the subscription basis and just finished payment back in August and was about to upgrade to the next level only to find out that Sonar has been discontinued so I can no longer upgrade. So I'm stuck with the basic version of Sonar which is kind of useless to me, is there any way to sell it back? I'd be happy even if I could get 70 of my $120 back.

Licenses I believe are non-transferable.

No

the refund policy is in the FAQ

Just wondering why it's useless?  SONAR still works, just no active development now.
 
You can add third party plugins to fill in any gaps missing in the stuff you want, and in fact this is probably cheaper for the most part than buying a new DAW.

you cant resell it but to be honest, I don't see anyone paying 70 for Sonar Artist especially seeing how Sonar is not being developed anymore. It was also sold for 99.00 brand new in the store.
Would you seriously feel good about selling a version of Sonar that is in its closing down stages (haven't heard about off line activation yet) ?