Performance rigging equipment, like all machinery, requires inspection and maintenance. Even with proper care moving parts will wear out. Lack of maintenance and inspections will only increase the likelihood of a component failure.
Failures can be catastrophic, resulting in property damage, serious injuries or death.
Assuming you have a limited equipment purchase budget, it makes sense that you would want to get the most out of your rigging system. Properly maintained equipment should give you trouble-free operation for many, many years. Equipment that is ignored will not. And finally, equipment failures can be extremely capricious. Murphy's Law dictates that a failure will happen at the most inopportune time.