“Building up a vertical” is mentioned quite often on these pages, and it’s always intrigued me.
What’s the intention? It will clearly be different for different people, and even for different wines. Do you intend to try them all together at the same time? Compare them all at varying stages of development? Is it just to build a ‘complete’ collection in the same way that some collect stamps, or Wisdens, or whatever? Once you’ve built your collection will you ever ‘spoil’ it by drinking one from the middle of a run?