Gym equipment should be maintained often, maybe every week or so. Gym equipment should be trained with once a day at the very least. If you don't want to buy gym equipment, go to a local gym/fitness center.
it depends on your body goal: if you really want to build a muscles you should do it like 4-6 times a week if you just want to loose weigh, do it like 3-5 times a week
Electrical equipment should be tested every 6 months like your smoke detectors and your furnace . Electrical fires are the 3rd leading cause of fires in Canada, so test ,test test.
Home gym equipment CAN be as good as the equipment at a gym, but you will have to purchase very expensive equipment and have a place to put it. It is of a professional quality because it's intended...