Little Darwin

It depends on the nature of your addiction.

I bought a used bike for $250 that was in good shape. I bought new wheels ($200), tires & tubes ($90), brakes ($40), cables ($30), grips ($20), bar ends ($12), bottle cages ($18), rack ($30), handlebar ($30)

But the bottom line is, I have a bike that is absolutely the way I want it, and it cost me about the same as buying the same model new, with the manufacturer's choice of components. Also, I now have a spare set of wheels with tires and tubes for road riding versus my usual rail trail configuration... and some spare parts that I may use elsewhere.