This is always an inspiring thread.

For those of you with verticals: how much do the tastings affect your attitude to the rest of that vertical?
Would you be inclined to sell/trade if it's not up to your expectation (or sell for a nice profit if it's exceptional)?

I tend to buy by the case, of wines I enjoy through tasting, but generally don't buy every vintage in order to begin or maintain a vertical line.

Ergo, my decision process is much simpler.