Long-term, it may be an issue for people who get Verified Fan tickets and continually resell them, since they are likely doing all of that through Ticketmaster, which means it is all trackable. But previously, there were individual people who used to own nearly half of the Book of Mormon seats and resell them, so it's a step in the right direction, although still problematic at present.
As for people buying more than they need and reselling them, with some of these costs, who can blame them? I used to do it for concerts all the time. Buy three and resell two of them for the cost of the three, etc.