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If someone bets early on 4th and there are 4 callers, there really is no point to raise with those Jacks though I would agree....you may not have a big enough equity edge, especially if there are some potential big draws out there.
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Your jacks may be the best hand at the moment, but still have no equity edge at all against many draws. Look at this sim:
http://twodimes.net/h/?z=2484666
pokenum -mc 500000 -7s js jh 4d 8d - tc td 3s ac - kh qh 2h 6c - 6d 7s 8c 4c
7-card Stud Hi: 500000 sampled outcomes
cards win %win lose %lose tie %tie EV
Js 8d 4d Jh 120727 24.15 379037 75.81 236 0.05 0.242
3s Ac Tc Td 133301 26.66 366699 73.34 0 0.00 0.267
6c Kh Qh 2h 110766 22.15 389233 77.85 1 0.00 0.222
7s 8c 4c 6d 134969 26.99 364794 72.96 237 0.05 0.270
Note who is actually in the lead!