It really depends on how you value your miles. 75K for a ticket that would otherwise cost $800 puts you at a burn rate of 0.0107 cents per mile. Personally, I value my miles at a slightly higher rate but the choice is yours.
I would definitely NOT, however, recommend you use the AS50. Since you only earn 50% EQM/RDM it's not a good deal anymore. If they bumped the EQM back to 100% for the AS50 I might consider using one again but as it stands I never will.