If you'll indulge an old newt guy with two cents worth ...
Perchance the problem lies in how you view the word 'hobby', and later ... 'amateur'. If I may be so bold, this modestly travelled Canadian has found that there are variations in how our english-speaking countries treat words (If you think that Canada, the United States, the United Kingdom and Australia all speak the same 'english', ask any citizen to describe what a 'football game' is!)
My experience in the U.S. is that the words 'hobby' (and later 'amateur' ... to which I'm leading you) is, while not quite a pejorative term, used to describe a 'light-hearted' approach to any endeavour. However, if you look at the definitions of the word(s), perhaps there is room for the herp community to embrace the word for it's own ... an uphill fight mind you.
To selectively quote some I-net sources ... (all italics and bolding are my emphasis or comments)
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the most common perception of 'hobby' is ...
hobby
An activity or interest pursued outside one's regular occupation and engaged in primarily for pleasure.
http://www.thefreedictionary.com/hobby
however, it is also, and perhaps more importantly ...
hobby (noun)
Engaging in a hobby can lead to acquiring substantial skill, knowledge, and experience. However, personal fulfillment is the aim.
An important determinant of what is considered a hobby, as distinct from a profession (beyond the lack of remuneration), is probably how easy it is to make a living at the activity. Almost no one can make a living at stamp collecting, but many people find it enjoyable; so it is commonly regarded as a hobby.
Much early scientific research was, in effect, a hobby of the wealthy or in your community case - the slightly outside of social-norms hot-keeper'; more recently, Linux began as a student's hobby
http://www.free-definition.com/Hobby.html
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The definition of Amateur that we're most used to seeing ...
Amateur (noun)
1. Someone who takes part in a sport, pastime, etc as a hobby and without being paid for it.
2. Someone who is not very skilled in an activity, etc.
Thesaurus: novice, beginner, initiate, apprentice, non-professional, neophyte, aspirant, hopeful, dabbler, greenhorn, rookie (US slang), tenderfoot.
3a. Unskilled or non-professional;
Example: liked to play the amateur detective
3b. For, relating to or done by those who are not professional.
Example: amateur dramatics
http://www.allwords.com/query.php?SearchType=3&Keyword=amateur&goquery=Find it!&Language=ENG
However, the definition of hobbyist is somewhat larger, and originally more 'professional' that that given by the prior site ...
“many amateurs make very meaningful contributions equivalent to or exceeding those of the professionals. To many, description as an amateur is losing its negative meaning, and actually carries a badge of honor.”
“…retaining its French inflexion ("am-a-tEUR"
, an amateur may be as competent as a paid professional, yet is motivated by a love or passion for the activity, like a connoisseur….”
http://www.wikimirror.com/Amateur
Before I blather on and begin to wax with purple prose, up here in Canada we tend to allow 'amateurs' and 'hobbyists' a bit more respect ... particularly in things involving nature. Perhaps it is because we've stayed a bit closer to our French roots ...
For my part, I am very much, very proudly (and very much advertised) an amateur herpetologist/herpetoculturist with a fascinating hobby of breeding (well, just watching actually) newts.
respects all,
Wes
(Lets see now, I know I have a press item to post that has the words hobby, newt, amateur and viper in it ... [shuffle-shuffle of much paper]).