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Renders are very important to selling your models. It's like good advertising for any other products. Even if your model is a perfect topology and great materials, if your preview renders don't illustrate those facts, then potential buyers aren't as likely to take a chance on your product compared to a competitor who may have better preview renders. Preview renders are your commercials for your products. So yes, buyers actually do pick your models based on your renders. So if you can't get a good render of your models because the materials aren't good, or the model itself doesn't hold up under HDR lighting or whatever, then it's going to be harder to convince someone to purchase compared to someone who has impressive preview renders.
