Why So Few Commercial Applications That Use RPC?

[will at cup.portal.com]

Given the widespread availability of RPC technology in the UNIX world, I
am wondering why haven't more vendors offered commercial applications that
make use of the RPC technology?  What are the technical or business issues
that keep process modeling or simulation or other mathematically intensive
applications from making use of the power of a number of machines on the
network?   Note that I am talking about applications that vendors write
and resell to end-users and not about homegrown applications.

Thanks,
Will Estes        (sun!portal!cup.portal.com!Will)