That's correct, but why do I have to pay Apple $99/year to install an app that I wrote on my own phone from own computer over a physical connection and not have to reinstall it every week?

Apologies, I didn't mean to insinuate that it was right that Apple charge $99 a year to install software on hardware you own. I just was pointing out there are ways around that.

Mostly that it gets around any review issues (mostly, unless you use external Testflight).