Which SAP instance are you suggesting to connect to, would I be so inclined? How would you start creating things for SAP vs. for example Facebook (or G+ now, or the Mac Store)?
There's a set of companies on the one side with broad public appeal and lots of ways to hack and tinker. On the other side you have a behemoth with an army of suits, costing you a couple of limbs for every move - and it's completely useless for the layman.
Note the last statement. If you don't run a business and are in a couple of related positions you just don't care about that stuff. If you are you're probably using and either loathing or loving it. But even if they had SAP in 99% of all companies, they'd still only reach a limited subset of people.