buy into vs get into

buy into

verb
  • To believe; to accept a craze or fad as valid. 

  • To buy stocks or shares of (a business). 

get into

verb
  • To cause to behave uncharacteristically; to possess. 

  • To become involved or interested in (a discussion, issue, or activity). 

  • To enter (an unfavourable state). 

  • To interrogate in order to arrive at a deeper understanding. 

  • To move into (an object), such that one ends up inside it. 

  • To put on (an item of clothing). 

  • To reach into or interact with (an object). 

How often have the words buy into and get into occurred in a corpus of books? (source: Google Ngram Viewer )