You're far off the path. I'm not into hiding my sources, but into learning on Perl as a whole. Since I can not 'prove' this you may believe what you like to. On the other hand, with you having no evidence for your assumptions, I think you're too quick in your conclusions on the motivations of posters.
On the library thing: I don't know too much on static and shared C libraries. But you may notice that, depending on your configuration, your Perl ships with those .a files, too. Including extensions as static into Perl does not seem to mean what you think it means.

~/tmp$ find perl -name '*.a'
perl/lib/5.8.8/i686-linux/auto/DynaLoader/DynaLoader.a
perl/lib/5.8.8/i686-linux/CORE/libperl.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/DynaLoader/DynaLoader.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/attrs/attrs.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/Cwd/Cwd.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/Fcntl/Fcntl.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/File/Glob/Glob.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/Filter/Util/Call/Call.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/Filter/decrypt/decrypt.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/IO/IO.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/IPC/SysV/SysV.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/List/Util/Util.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/MIME/Base64/Base64.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/PerlIO/encoding/encoding.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/PerlIO/scalar/scalar.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/PerlIO/via/via.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/Socket/Socket.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/Sys/Hostname/Hostname.a
perl/lib/5.8.8/i686-linux-thread-multi/auto/Time/HiRes/HiRes.a
perl/lib/5.8.8/i686-linux-thread-multi/CORE/libperl.a
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