I sell consistantly on turbosquid. I have more than 500 items for sale. Textures for $8, models for $20 - $50. They charge a 50% commision in all but a very few cases. It’s a great site, and I’ve made about $600 selling things on the site ($1200 total sales). A $350 model has to be absolutely incredible to sell. A whole Arab town filled with props, game ready for example. Not one sword. It will never happen…sorry. I’m not saying it’s not worth it, but you’ve got to understand that people who will be buying your models have a whole job budget - and they likely will not spend it on one sword. You can try it, but I’d recommend as someone else here did to sell it for $35 ten times. That may happen.
Volume and variety is the key to success on Turbosquid. Also, act like you are the buyer. Publish wires renders, untextured and textured views, loads of descriptions etc. Answer every question. Don’t go minimal and expect a sale. More info = more sales. Everytime. Make the customer comfortable enough to spend the money.