That's definitely part of the reason.I was thinking more "I want to show someone this new spell I made after lots of hard work!" to "I worked really hard on this and I'm using that fact as a crutch! I'm turning a blind eye to the potential and likely consequences!"
Also, why Serrin's so scared of Disjunction: One of her ancestors invented the spell, and one of her ancestors was de-magicked by a backfiring Disjunction. He committed suicide a few months later. In Aequar, elves are mildly magical creatures by nature. For any spellcaster to permanently lose their magical abilities is horrible enough, but for an elf it's a fate worse than death (and for an extremely magical creature like a dragon...). How many of you read that passage in Lords and Ladies about the elf getting hit by the iron?