Why use the automatic ticket vending machine if the museum is free

We know that many museums have implemented a free policy, but we found that when the museum enters, it still needs to collect tickets. What is the reason? Picture: There are actually two general reasons for the automatic ticket vending machine used in the museum. The first one is from inside the museum. Because although the visit is free for the museum, statistics on the number of visitors still need to be carried out, such as the statistics of the number of visitors, the statistics of age groups, the statistics of the regions from which they come from, etc. If you do not get tickets, then It is impossible or difficult to count. With the automatic ticket vending machine, people collect tickets by reading ID cards and other documents, so that they can directly count the required information. This is the first reason why the museum still uses automatic ticket machines even though it is free. The second reason is actually the consideration of tourists. Every tourist wants to leave some souvenirs, photos, souvenirs, etc. when they go to travel. The ticket is a very meaningful souvenir, so out of this consideration, tourists can collect the ticket and keep it as a souvenir. The procedure for collecting tickets is retained, which is why the museum continues to use ticket collection. Through my simple analysis and explanation, do you have a certain understanding of this question?