I don't like 'tribute bands' because they are not a 'tribute' at all - they are simply piggy-backing the talent and success of other musicians.
But for every nerdy purist like me, there are thousands and thousands of people who just like hearing the music of their favourite artists at a fraction of the cost of the originals.
In some cases of course, the originals are not longer with us, so I do enjoy a decent Beatles tribute, and I have seen several who make a decent job of bringing that later songs, which were never intended for live performance, to a concert setting.
But as a general rule, I avoid tribute bands, simply because I like the real thing, or not at all.
But of course, there is a massive market for them, and if people like them, I would never wish to stop anyone either making a living, or people having a good time.