Nah, too. Just cost of upgrading a part on a rifle. I think the basic rifle is worth upgrading, rather than going to a new custom BR rifle costing 5x or 10x more.
I've found it's an advantage if you're just learning to buy a factory sample first -- an "on sale" basic model is fine if it's cheaper. As you decide on your wants and needs, upgrade as you go. Once you start wanting to replace more critical parts like the barrel and receiver, it's time to buy the parts independently so you can get what you want. You can even scavenger some of the upgraded parts for the new build and replace the original parts on the sample.
Keep the first rifle as a baseline. If you experience problems or get stuck figuring out how to put something together on the new build, the factory rifle may show you how something is installed, seated, oriented or functions.
My first AR15 was a Colt 6940. Once I became comfortable upgrading furniture and triggers, I bought all the lower parts to assemble and a complete upper for my second AR. The third one I built both the upper and lower from individual parts. Having those samples to follow and gain experience modding made the full build a piece of cake.
I also accumulated the proper tools to work on my ARs, which I think makes the whole process easier. Whether you are upgrading from factory or building from the ground up, this cost is going to make both upgrades and builds more expensive than the factory price tag normally. I've always believed in picking the right tool for the job. It saves time and money in the long run, and usually avoids problems caused going the "Bubba" route.