Very good post, and tough decision. It's a Sat, and you are tied with three other stacks and only top 4 pay money. Sklansky would love to analyze this one.

Your M is 4.1 and your effective M is 2.5. Things are getting desperate but I think I would fold here b/c I hate being the caller in this situation and you have no fold equity.

I would rather wait for the next good opportunity to do the same with the Harringtonesque "first-in vigorish". IF he has an Ace you are probably dominated and if he has a pair you are behind. Wait for a better spot. Tho not too long.

My main decision to fold is based on the fact that there is no money for 6th or 5th and such a big difference for 4th.