Whose fault to hold a Teacher Appreciation Banquet in the kindergarten?

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Teacher Appreciation Banquet is the past was not a banquet, just simply treat teachers to have a meal with sincerely thankful feelings, but without any comparison and showing off. It's a nature expression. However nowadays, Teacher Appreciation Banquet becomes a popular parctice, graduates in senior high schools, Universities, and elementary schools, even kindergartens that they all hold a banquet. According to the report, in elementary schools' graduation, parents only treat teachers in a higher-level-restaurant. and the cheaper ones still cost 400-500 dollars. The minimum price for a high-level-restaurant is over 800 dollars, even 2000, or 3000 per table. Even more, no highest prices limited for some restaurant that list superlative recipe, etc. like sea-ear this kind of slap-upfood in the meau. Is it necessary to hold Teacher appreciation Banquet greatly in kindergartens from so young age? Whose fault to make such the situation?