What length exactly?
Both Sony and MS released, at some point, SDKs that could use a retail unit for development [1,2,3,4] so I am not sure this is exactly why.<p>1.<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;PlayStation_Mobile" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;PlayStation_Mobile</a><p>2.<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Linux_for_PlayStation_2" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Linux_for_PlayStation_2</a><p>3.<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;OtherOS" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;OtherOS</a><p>4.<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Microsoft_XNA" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Microsoft_XNA</a>