I usually buy those cheap 2-3 burner grills for $95-$100 at Lowes or Walmart.

I don't do a whole lot of really greasy cooking on them . I make sure the grill itself is clean and I'm good to go. The life expectancy, regardless, is 2...maybe three years. I replaced the burners once and realized they were about a third to half the cost of a new grill. At the Fire Station?? I used to BABY our big stainless steel grill. I'd give it a once over every 3-4 months. Had to because of idiot Firemen that abused it.