Sounds like a brilliant plan to me. You would never need IPMI to remotely access server hardware if the OS fails to load. Nor do you need to get one with redundant PSUs in case one fails. And you couldn't possibly need the 24/7 on site support for a year or more that comes with most server purchases.
Yeah, that's the sad thing...you can piecemeal it, but if you want to do anything remotely serious, you need the big-boy toys, which come with the big-boy pricetag. There are IP-KVM's & other goodies available, but it's not like say a turnkey Dell where you get 4-hour replacement service, dual PSU's, remote access, ECC RAM, server-grade drives, battery backup on the RAID cards themselves, etc.
That's not to say there's not a place for homemade servers. I build them as appropriate. It's pretty nice to buy able to buy an 8-core Intel chip with 64 gigs of RAM & a 2,000 mb/s G.Skill PCIe card, and buy a complete set of spare parts for a hot-swap server, for a few grand. Or throw up a Synology NAS with 30 terabytes for around $3,000 with basic domain functionality. But for anything I'd really want to set & forget, heck no! :awe: