Just the thought of millions of tefillos and tears our forfathers shed that their children and great-great grandchildren till the end of days shall be Talmidei Chachamim and Yirei Shomayim… is good enough a reason to want to marry into a family with Yichus. It means their grandparents were connected to Hashem and knew what was important!
another point is that good Middos travel down to the forcoming generations.
mazel tov and may all those searching find their Bashert easily!