Honestly, here's my process...

It has to jump out and grab me, or I won't waste my time.

Then, I research the hell out of the maker, and the blade itself.

At that point, I try to think of what I'd use it for (I'm really not a collector).

Then if the price seems reasonable, considering all the other factors, I pull the trigger.

However, the S5 did not follow that logic (for the first time in a long time) in the sense that it didn't jump out and grab me, it grew on me over time.