I've never even talked with another
    person that had heard of Firefox OS.
    How could you possibly know that
    customers don't want it?

I could pick anyone who didn't have the slightest clue what FLOSS means, besides something they should do at least once a day, and ask them about a FFOS phone. Here's how that conversation would go down:

Me: Hey, did you know you can get a smartphone for $33?

Them: Cool! That sounds great, and $66 cheaper than my iPhone.

Me: Yeah, that would totally pay for 3 weeks of your cell phone bill.

Them: Sounds good, so I can get Instagram on it, right?

Me: Yep, except you won't be able to post photos.

Them: Oh. How about Flappy Bird.

Me: Nope, sorry.

Them: Darn, but that's ok. Too addictive. How about Uber, Whatsapp, and Facebook?

Me: Totally! Mobile web all the way, baby! HTML 5!

Them: Awesome!

<2 Weeks Pass>

Them: I went back to my iPhone. Those mobile websites suck.

You obviously wouldn't be having that conversation with me. You might want to consider that others might not use a phone the same way you do. ("Anyone" is a pretty bold claim.)

Though I would really love it if you could show me where to get a $99 iPhone.

I think he meant that non-tech guy X considers his generation old, contract based $99 iPhone as costing $99 period.

I realize that, but there are a lot of people out there that are smart enough to take the monthly cost of the contract into account, however you want to describe them. I do a lot of programming, but am a "non-tech" guy myself.

Unfortunately there isnt much to be had FLOSS-wise over android with FX-os as they use the same shitty closed source driver model as android.

I dont know why anyone would want these phones.

You might want to explain the true cost of an iPhone to them.

T-Mobile's doing a great job of that. Or are you talking about "Ring 0 freedoms"?

Suggesting that an iPhone costs $99 when it costs $99 plus monthly contract makes the comparison less than useful.