Neither of the two (2) Bigfoot games exist now. One was dismantled, and the other was unconfirmed destroyed. Only backglasses exist. Those that have been collecting for over 30-40 years would have uncovered it by now, since we know who most likely would have one. Most of these collectors are not on PinSide.

The remaining game has never resurfaced.
If a person wants to refer they own the game (as stated), a few people could validate the authenticity.
Many people on this website up until a year ago, never even heard of the title.

Any of the solid state games I still own in my collection are solid winners, as most have been with me for over 20+ years for a reason.

Big Bang Bar is an above average game with an extraordinary price tag, but the reproductions by Gene Cunningham (IPB) where of better quality than the original prototypes (but the Capcom original adds an additional $8-10K in cost). Keep in mind CGC still quotes that "BBB will be remade". Personally, I find the quality of all Capcom games only slightly less than most Bally/WMS games of the same era, but have superior dot matrix animations and sound.

I believe you could own many more games with $100K than 12, as high end examples are a demeaned on value comparative to the same game equivalent borderline super+/collector quality for less than 3/4 of asking prices. Limiting yourself in this area is going to mean wasted dollars, unless you are hiring someone to find the games for you.