Hehe Gunthr, the germans have a general term for that: fachidiot.
I dunno Santa, your analysis of the "it gets boring" argument is faulty.
The assumption is not "doing something repeatedly induces boredom." For an appeal to sex (which most of us don't seem ever to get bored with) disproves that case.
Sure, this is a UBB discussion, so we like to be brachylogic. I would say the full argument here is the following:
assumption: Enthusiasm stems from anticipation of the reward for a given activity. (Dude let's go to a party and get loaded, who knows maybe get laid)
When the range of the reward (dude, who knows, maybe I'll end up in a 3-on-1 with the Swedish bikini team) and the value of the reward (dude, getting loaded is the best thing out there) are known with less precision, it is possible to have greater enthusiasm than if the range and value are known with more precision (=jaded: Dude, if I get laid, it's gonna be either A: with someone who has an unsatisfactory appearance/body odor B: with someone who has a host of phsychological problems or C: with someone of a sex and/or core gender identity that I find undesirable; Dude, getting loaded just means I'm gonna spend another sunday wiping the puke off the floor.).
What that means is that enthusiasm, the anticipation of the reward, should remain constant throughout life, but should be directed with greater precision towards its maximal hedonistic potential. Likewise, in some cases, knowing more about the nature of the reward does increase enthusiasm in some cases. Take Art Openings, for example: who'd go to one of those snooty things? Wait a minute; Free food, free booze, you're actually encouraged to rant about the crap someone's slathered on the walls, babes, what's not to like?