Hold on. MG Siegler and Arrington were investors in Mailbox? This kind of conflict is really unacceptable. Bloggers need to get real about ethics if they want to be taken seriously as journalists.
I don't think "acceptable" applies in this particular context, as these are not journalists that have to obey a fixed set of rules and regulations, rather, they are people that will decide, out of their own set of standards and moral, completely subjective to the person.
Ultimately, we have to vote with our eyeballs and clicks and, if you believe that a site/blogger does not match your values, simply don't read them. That said, its hard to get the masses off of bacon and fries, regardless of how bad they are for you.