What is the biggest frustration or problem you have had when trying to sell 3D models?

Yeah, me as well. In dire need of a vid card upgrade. It has been taking a full day just to produce nine or ten preview renders. I can only render simple scenes so as of yet I haven't been able to create a decent portfolio. That is most of the frustration. I want to post work on Artstation etc but I really can't. Have saved some money though and will be buying a new card for my work machine hopefully in the next few weeks.