Currently having a racing bike at all is probably a waste of money for me at present.
But I typically buy things at a pace closer to Waterrockets than to the typical road weenie -- i.e. a new bike a decade -- so I don't have many regrets.
Nevermind -- thought of one -- the on clearance Northwave Hornet shoes. Never could make them comfortable, but I only paid $55 and got a year out of them.