Are actors more or less likely to sign on opening night?

Are actors more likely or less likely to come out the stage door and sign on opening night (as compared to what they usually do)?

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Less. At least on/off Broadway, there's almost always an event afterwards, and there's all kind of pressure to change, get your makeup/hair done, and get there as fast as possible.

Even if you're not traveling en masse (like in a bus), your agent, etc, wants you there a.s.a.p. to work the room.

In this situation, the professional obligation to socialize and circulate among the money people and industry people will almost always outweigh the professional courtesy of signing at the stage door.