Au contraire, if they had the power (which unfortunately they usually don’t when they are depending on a promoter) they could apply any condition they wish, just like airlines do to seats they sell.
Every measure of security and limitation that you place on a ticket adds sales/distribution infrastructure overhead expense to the ticket price. Trust me, I've spent a lot of years on tour buses with multi-millionaire performers and I have never heard even one of them complain about high ticket prices while they were earning and counting their money. Most of them would gladly push their ticket price up to $1000 each if they thought that they could still sell out the venue. The only time I've ever heard an artist complain about high ticket prices was when they have a fan complaining to them or they have to speak about it in public, which is actually a lot of bullshit since it is really the artist that determines the initial ticket price. As far as scalpers, the artists hate them because, often times, the scalper is actually making far more net income on the artists product than the artist is. One of the hotter, and quieter, things currently going on in the music biz these days are "private" concerts. These are concerts thrown by corporations and private individuals for special events. The artist can net much more on these since the overall production costs are lower and almost no middlemen.
You actually think performers care if tickets go high? They say they do to keep the majority of their fans happy but it’s a load of BS. Most get a portion of the net proceeds.