IMHO, you would face the trademark issue, because you're the one attempting to profit from it under the admission that Tekken 10 is not your game, trademark or commercial product.
The registrar or domain authority can't be expected to search for trademark issues for every automated sale made; they're just supplying a generic service that's the same for every name being offered, trademarked or otherwise. So really, they're not profiting from the trademark infringement, per se.
In my limited understanding of trademark law, trademark owners have a responsibility to police trademark infringements or potentially risk losing their trademark. As an example, the owners of Tekken couldn't knowingly overlook somebody's usage of Tekken10.com, wait until it generates tremendous profit and then sue them for those profits. That could be the result if they genuinely had no knowledge about the infringement, but that's an argument that would have to be raised in court. If, however, they are found to have had prior knowledge and waited until it was profitable to sue, then that's bad faith, and there's a real possibility the courts could decide their negligence forfeits their trademark.
From a legal site that discusses the trademark's owner to pursue trademark issues from TLDs and gTLDs (my account can't post lists; sorry):
"Trademark owners must proactively police and pursue infringement on the Internet in the same manner that they police and pursue infringement in other arenas. The consequences of a failure to do so range from loss of sales to loss of rights to use a mark. "
Either way, it's a risk, so I agree with Paul that it doesn't really have value. Of course I could be totally wrong, so good luck with it.