Maybe, but what surprises me every time I browse the App Store is the amount of expensive apps I encounter. There are many textbooks that have made the jump to iPad while keeping prices that are far above $10.<p>For an example, see <a href="http:&#x2F;&#x2F;www.pcronline.com&#x2F;eurointervention&#x2F;textbook&#x2F;pcr-textbook&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.pcronline.com&#x2F;eurointervention&#x2F;textbook&#x2F;pcr-textb...</a>:<p><i>&quot;Get the iPad application for only $149.99&quot;</i><p>Maybe that is just a web site in an app with limited interactivity, but there definitely seems to be competition in that market. The disadvantage of free updates in such markets may be more than balanced by the advantage of very limited ability to resell apps (the easiest way I know to resell apps is to create separate iTunes accounts for each app, and let te buyer set a new password for that account. That becomes impractical soon, of you have tens of apps)<p>That 3D knee visualization, to me, seems a clear indication of that.