I think it depends on the frequency that you loose power in your area.
I have a 13KW gas generator, Honda power that I bought just prior to Y2K, as my wife was freaking out then.
It's strictly hook up when needed and we needed it once for a couple of days about 10 years ago.
If you can justify the expense, what you quoted is realistic, if not more, then that combined with your outage frequency will give you piece of mind.
But yeah, the price installed is huge.
Something I've noticed is power company's are getting into this business, have you checked with your provider.
Entergy is my provider their prices are lower than going through a third party, not by much though.
Something else to consider is the maintenance/run schedule that is recommended you do on them if you have one.
Kind of like engaging 4x4 regularly so it works when you need it.
Been losing power a few times a year but last year it went out about 12 times. This forced me to consider a generator.
After thinking about the critical needs when power is out, I decided on a 4k watt genny from HF. It has plenty of juice to power my fridge, freezer, pellet stove, and a light for about 11 hours on a tank. Running anything else is unimportant and a waste of electricity for me.
I also found the genny pretty darn useful outside the house where there are no outlets.
Since you stated you have found uses for the generator "outside" the house, I sure hope when using it for inside power you still have the generator located outside, I sure don't want to hear someone has died from carbon monoxide!!!
I know most know to have the generator outside and not inside while it's running it, but there are some for whatever reason doesn't know that it can kill someone, so consider this post as a FYI/Public Service Warning for those not knowing the danger of running a generator or any internal combustion engine inside the home!!
During the last couple of hurricanes here in the southeast there were several deaths from generators being ran/used inside the houses without power!!
Sorry I worded that wrong. Genny is always outside. I meant for using power tools to do work outside where it normally requires an outlet + miles of extension cords.
I have an electric chainsaw that sees alot of use and the generator makes using it so much easier.