There will always be two schools of thought regarding building. There's the "DYI" verses "Buy it and bolt it on".
I've seen this in the street rod hobby for years. Those of us who build our parts, find suitable items in salvage yards, and have the tools and skills to fabricate will always suggest the cheaper route when it comes to building a project.
Then we have the other side who, for whatever reason, elects to simply point and click and wait for the UPS truck. We used to call them 1-800 builders before the Internet offered an alternative to the telephone.
There's absolutely nothing wrong with either approach to building. It's just another example of why there's chocolate and vanilla.
The important thing is to build the bike for safety and reliability. However you accomplish that is not the issue. Nor is how much money is invested.
Tom