Yes, you could charge 10x more. You could charge N more (why stop at 10x, 1000x!), but would anyone pay?

You started at 5 USD and you're not publishing it because as you indicated earlier in the thread, you're price testing. I assume that means finding the price point the most people are willing to pay for the product. For a product with low marginal costs, getting data on what users want so you can keep expanding that pool is revenue maximizing.