[Solitare]

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If you were the BB with 5 BB's remaining and it were folded to the SB, who also had 5 BB's left, and he went all in, are you throwing away 55?

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Unfortunately, what you describe is not a slightly +EV situation.

Here the range of the small blind is huge, possibly any two. If SB's range is the top 60% of his hands your 55 is a 54/46 favorite.

On top of this, you already have 1BB in the pot, you are calling 4BB to win 10BB, so your calling odds are 40%.

Calling with 40% pots odds to win 54% of the time is more than slightly EV+. Fold and you have 4BB. Call and your EV is 5.4BB, a 35% increase.