There are generally two levels of quality for gym equipment. The first level is home gym equipment, which is usually inexpensive and made with relatively thin metal which can support the needs of 99% of home gym users.
The second level of equipment is commercial equipment which is made from higher quality components and thicker steel which can handle whatever weight a user might be able to move.
A third hybrid market has appeared in recent years which is near commercial level quality targeted at the home user who wants higher quality than what is generally available at sporting goods stores. This third category is growing thanks partly to the increasing popularity of fitness movements like CrossFit and the various cross-training methods that put more strain on equipment and demand higher quality while also not breaking the bank.