I have noticed the custom built rods on the best blanks have a very poor resale value. A local shop will take used rods in trade and the factory originals will obtain much higher trade in allowance, they have a difficult time selling used customs. Check out eBay and other sources for used custom rods and compare the prices to used factory rods.
I own several very well made custom rods and many factory originals, the much hyped better performance by the custom makers is not apparent to my casting style.
If you can make the rod yourself it is very economical and a great learing experience. IMHO paying more than factory for a custom is a poor investment.