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I believe there is a big distinction made between link spamming sponsors in every post and using display advertising, both for mainstream and adult tumblrs.
Also not to forget, there is a nifty import tool to transfer your tumblr blog content to wordpress. I often use tumblr to jump start a domain by running it as a tumblr for a while. Gaining easy backlinks, waiting for the initial sandboxing to be over and judge the potential of the niche I am targeting.
Often if I gain a top placement with that I'll keep it on tumblr, if I need to broaden the approach I'll transfer it to wordpress. Done it plenty of times without a hitch.
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