Commercial lights will last far longer than residential lights - sometimes the lifespan will be 500% more. This will not only save you massive amounts in lights themselves, but also save you maintenance costs which can be a killer.

I would say the cost is absolutely worth it. If you try to install a residential light like a downlight in a commercial setting, it will work at first but very soon you will get a high failure rate. Residential lights simply can't handle the sort of loads that commercial areas demand of them, such as 24/7 uptime, vandalism etc.

Lifespan is the biggest difference, commercial grade LED lights can last 5 or even 10 times as longer.