Domains are auctioned off based on their age and domain authority which means that you only really have a good chance of selling domains that have a couple thousand page views per month. Buying a bunch of domains and immediately trying to sell them isn't going to work because you can see, there are registrars where you can buy these names for just $10 or $15. Certainly, you aren't going to find any buyers at 0.03BTC (and bidding will probably just stop once the bids go over $30).