I BBQ 6 out of the 7 days of the week and have been doing so for over 20 years.
I used to use Kingsford and wore out more grills than I can remember using charcoal.
IMO, while the taste is much better using charcoal, I was going broke buying it...
I switched to gas about 9 years ago and two years ago I plumbed my house natural gas on my back deck to the grill.
For my usage gas is the only economical way to go, I still think charcoal is better tasting - but there are tricks you can use with a gas grill that enhance the flavor.
I used to be a diehard charcoal guy, but gas works for me!