I agree that the whole deem-and-pass maneuver for getting health care reform through the House is silly. Of course, the costs of doing it are pretty small -- at this point, people disposed to hate on Democrats for process reasons will be hating anyway. And those people were likely to be voting against us from the start.
The benefits, I think, are that House Democrats don't get attacked for voting for the Cornhusker Kickback and other annoying Senate bill stuff, and instead get attacked for using deem-and-pass. This is slightly better, since the Cornhusker Kickback might annoy an actual swing voter while nobody really cares about deem-and-pass. Of course, if attacked for voting for the Cornhusker Kickback, they would've been able to say "I voted to pass health care reform, but then I voted to strip bad stuff like that out!" And really that should convince people, and probably it will, but in the shadow of John Kerry's infamous "I actually did vote for the $87 billion before I voted against it" somebody or other is really nervous about trying to say anything like that.
Anyway, that's my guess about what's going through the head of the marginal House Dem who is more willing to vote for the bill if the leadership does the deem-and-pass thing. This is all of minute significance, but I guess while people are talking about it I might as well too.