When the best solution may sometimes not be the best fit.
As painful as this truth may seem, merely selecting the best solution for a problem may not be the most important decision criteria. The solution by itself is not always the only answer. It's about fit. Fit with everything, including the solution history. By the way - if you still think that your contact is the only one making the buying decision (unless of course you are talking to the C-suite)...then you're probably not making too many sales. The vendor needs to be savvy to