I bought two Walmart bikes. They were garbage and unpleasant to ride, so I didn't ride them. They sat in my garage and rusted.
I bought a good bike. It was $50 more than the Walmart bike I was looking at. It was a pleasure to ride, so I rode it as much as I could. I lost 40 pounds, cured my sedentary ailments, got into cycling, joined a bike team, did charity rides, and changed my life.
Best $50 I ever spent.