Lets assume you want to go to open houses because you have NOTHING else in your life to do, and you are not looking to buy a house.
To what end?
So if you only select open home between 100,000 and 300,000 the question is , what are they worth?
So you see a home listed at 250,000 whos value is 150,000 and you are approved at 100,000, just why would you show up? Do you think you can buy a 150,000 dollar home for 100,000? Guess what, the market place will find another buyer to offer 150,000. You are not going to buy a 150,000 home for 100,000.
By all means, go to all the open homes you want to go to, have fun, enjoy yourself, free cokes and cookies, but when you are ready to buy a home, call a professional Realtor who will get you going in the right direction to buy a home.