Why are people buying the Sport II? Why not buy a optic ready carbine with a low profile gas block no handguards and simply install what they want. Once they have hacked it up the warranty is not going to be 100% in play. It doesn't save any money to pay for parts you are not going to use. Buying an OEM optic ready gun and installing the parts you want from day one makes economic and just plain common sense.
So educate me why are people still buying Sport IIs?
This isn't your precise scenario - but it might be an indicator of how others might be thinking.
I have one AR - the Sport I. I got into the world of ARs a little reluctantly. I wanted a semi-auto center fire rifle. (Purpose: general range plinking and paper punching.....no hunting.) I was considering an M-1 Carbine (if I could find a cheap one), a Mini-14 and an AR. I grew up with wood/blue steel guns so that's my orientation. Frankly, I don't really care for the looks of ARs. And I REALLY don't like tricked out ARs. But I'd heard such positive things about their accuracy and fun I decided to give 'em a try.
I'm sensitive to assuming or projecting what I'm going to need before I decide I need it. I've been burned in other hobbies where I basically over-bought. So I like to take things one step at a time and invest incrementally based on what I know I want. I knew I'd put a scope on. But I bought the Sport and put a few hundred rounds through it before I finalized the scope decision.
After I'd used it for a while I decided to put in a better trigger. I went nice - Geissele SSA-E. Now the setup is doing what I want, so I don't feel compelled to invest more. The front post bugs me a little. I might swap it out - but it's on the edge between would I rather save the dough and look at it or pay for some cleaner lines.
Buying an entry-level got me in the door cheap - and I could make slow deliberate decisions about upgrading as I got trigger time with a platform I wasn't familiar with.
Now.....these folks that buy an entry level such as the Sport and upgrade pieces that could be had on stock, higher end models, I don't quite understand.....unless there is something specific about an upgrade that can't be had as stock on any model - entry or mid-range or high-end.
OR
P.S.: Given all the above and my experiences, now that I have AR time and understanding under my belt, I wouldn't be at all surprised if sometime down the road I sell my current Sport and get a higher-end configuration.....because now I *know* what I want and don't want.