Some of my favorite long term keeper pins are purchased before ever playing. The great thing about pinball today is we have streams and videos to help make up our mind. If you’re an experienced player, and know what you like, you can typically know from a video and reviews whether you’ll like it or not. A dozen plays on a location game can be deceiving on whether it would make a good home only pin or not.
That said, $10k is a lot of coin whether you play it before or not. The good news is, JJPOTC is ceasing production for an undisclosed amount of time, so you really shouldn’t be too fearful of losing much money. You’d probably lose more flying to a big pinball show haha! Your biggest worry should be how much you have to tweak this pin and be under the hood rather than knowing if it’s good or not.