I found a problem when trying this on a bigger file (my book file):  If $1 (actually, #$1) is for a link target that doesn't exist, then org-mode goes into its "No match - create this as a new heading? (y or n)" routine. That causes the rest of the export to fail.  It'd be better if get-title could do the same thing org-mode does natively, that is, including the text of $1 as italics to indicate a non-existent link.

Example file below:

--8<---------------cut here---------------start------------->8---

#+MACRO: get-title (eval (save-excursion (org-open-link-from-string "[[#$1]]") (org-get-heading nil nil)))
#+MACRO: SECREF [[#$1][{{{get-title($1)}}}]]
#+OPTIONS: H:7 toc:nil num:1 email:t author:t

* Introduction to Technology Contracts
  :PROPERTIES:
  :CUSTOM_ID: IntroTechContracts
  :END:

Lorem ipsum etc. etc.

* Dangerous Clauses
  :PROPERTIES:
  :CUSTOM_ID: DangerousClauses
  :END:

Lorem ipsum etc. etc. -- see Section {{{SECREF(
BogusLinkTarget
)}}}

--8<---------------cut here---------------end--------------->8---