Potentially good reasons for not licensing in include :

• Becoming reliant on other's technology and remaining at best second best.
  
  
• Losing the ability to develop one's own technology and IP resources.
  At first this may not seem important but in the longer term the
  knowledge required to outsource R&D efficiently may be lost.
  
  
• Increased costs of licensing in
  Historically, licensing royalties payable by licensees have rarely reflected the true cost or value of the licensed technology and enabled licensees to catch up licensors at bargain prices. The recent past has seen a new concern to exploit IP assets fully and this may have made licensing in a slightly less attractive option.
  
  
• Insufficient resources to successfully commercialise the licensed technology.

Bad reasons for not licensing in include :

• The "NIH" syndrome or Not Invented Here syndrome
  Internal pride, prejudice, or misplaced confidence in the firm's own abilities may lead to any external technology being rejected however good an opportunity it represents.