I have built up 3 bikes currently with parts. One a lovely hybrid with a 8 speed XT rear derailleur XTR 9 speed shifter, a Tiagra Hollowtech II crank that also had the BB, a set of Surly Moloko bars and some other fun parts I didn't spend anything on or spent very little on. The second was built up as a vintage road bike with a mostly complete 600 Tricolor gruppo that I bought for $20 that came on a Guercotti bike I gave to a co-worker. The third was built up as a touring bike for a smaller rider and just need to get it sold at this point but unfortunately the last buyer backed out when he left the company. I have also helped various friends out with their bikes and picked parts for various other builds to keep things going. I just pulled another frame that we were tossing and am planning on throwing more parts on that and probably giving it away to a friend who could really use it.

Basically having parts in stock have saved me and built me some really awesome bikes. Granted yes I have stockpiled some primo parts and some oddities but I wouldn't want to live without them. I love the fun of rummaging around the parts bins and building up a bike from it, it is an awesome feeling.