Does anyone else tend to lose interest in playing boosted characters?

For whatever reason, when it comes to boosted characters, be it straight up via the service or leveling events such as the pre-Legion invasions, I tend to lose interest. And it applies to pretty much every MMO I've ever played.Even if I don't particularly enjoy playstyle of a class, I prefer playing a toon I "raised" myself, rather than ones I boosted or leveled really quickly. It's not like I conscientiously think "this one has more achievements, more quests done, more zones cleared...", it just happens.Do you guys feel the same or do you treat all your characters (other than the 'main') mostly equally?