How often do you use your portable generator?

If you are dry camping for periods of more than your battery's will last then you should consider one.If you have an a/c and dry camp then you'll need one.
I dry camp 98% of the time and have three battery's s which need to be charged several times in four to six week trip. When it's colder more charging as battery's loose amps as the temps drop.

My wife likes to use her rollers and blow drier after washing her hair in the morning. I run the genny for that. I like to use my induction hot plate for boiling water for the dungeness crab or fish fry when camping at the coast.
I have solar to keep the batteries topped off but, if it's hot, I'll run the AC for a few hours during the hottest time of the day. It's worth it to just have on hand when you don't know you might need one.

I have 2 generators and have never used them for "camping" even though that was the intended purpose when they were purchased. We always have electric hook up.

Now, the generators come in REAL handy at home. We live in the country, and when we have a power failure, those generators come in real handy. I fire them up. Run a couple lines inside the house and split off of them.

1 line goes to the freezer and refrigerator. I switch them every hour.
1 line goes to the television and Dish Satellite receiver.
1 line goes to the internet modem and router.
1 line goes to a light bulb.
in the winter:
1 line goes to the blower on our fireplace.

Nice thing about having a generator, you can take it anywhere. Many, many, many years ago, I went to a baptismal. It was at a small river along some guy's property in a cornfield. Someone brought a generator in the back of their pick-up truck and someone else brought their electric organ from their home in the back of their truck and someone else brought an electric guitar and someone else brought a set of drums. They plugged into the generator and it really gave new meaning to the old song, "Shall we gather at the river!"

Bottom line of my rant: Generators come in handy for much more than just using your camper.

almost every trip is dry camping and I run it to charge up the batteries each morning and to run the ac when needed

We use ours for short periods of time. We charge batteries and sometimes operate 120 volt appliances like the AC, grill toaster.
Whether YOU need a genset is based on your style of camping. If you do a lot of dry camping, then you should consider one.
I am guessing you are looking at a Polar Cub sized AC unit. You would need to calculate your genset size based on the AC unit plus converter amperage and then what other 120 volt items you are considering.