It can’t hurt anything but your pocketbook. I do believe seeds are designed to withstand poor storage conditions though and last a long time when stored well. After all they go through wet fall and winter outdoors and still manage to germinate.
The reason heirlooms cost so much is, you generally don’t need to buy them again from the supplier. Collect your own seed from the crop and keep enough in storage for multiple plantings. Here’s a link to a chart for anyone wondering about storage times for seeds.