I expected a longer lifespan than 7 years for the price

When I first got this bed, I thought it was too hard. I bought all sorts of toppers to make it softer and then I fell in love with it. That lasted less than 2 years. I started having trouble with it being too soft in places and then still too hard in others. I had removed any toppers at this point and that may be why it was hard in certain places. I have to admit this is on an adjustable base which I bought with the bed. Now, knowing what I know about memory foam this may have contributed to the bed breaking down so fast. I know that is not promoted when you buy it but if just sleeping on memory foam breaks down the fibers, imagine what going up and down daily with the base does to the fibers. I just wish that someone would explain all this at the time you purchase it because you don't spend that much on a bed and expect you will have to replace it within 10 years.