First off, they don’t. There are numerous ticketing companies aside from Ticketmaster.
Second, it’s not the bands. It’s the venues and promoters.
So why do most venues and promoters use Ticketmaster? Because it’s the largest ticketing provider, which makes it easier to use and makes it cost less. Also, many venues are owned or operated by Live Nation, which owns Ticketmaster, so they obviously use their own company.
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