I respond to this with the utmost humility and respect for all involved, including those opposing my opinion.
I am a novice magician, but when I get to where I want to be I will carry no more than 54 tools with me to perform magic with. A deck of cards, and my two hands.
I think "pure" tricks are the fairest way possible to interact with your audience. Yes, the argument can be (and is) made that to your spectators, it might not... well, lets face it. It probably won't make a difference. So I can see the self serving side of the argument. However, I do know of people who aren't magicians but have seen an invisible deck, duplicates, and they know some of the most basic gaff tricks. I've seen tricks with certain gaff cards before I knew what the term "gaff" meant and it never really impressed me. I always thought things of that nature were approaching the line of clown magic.
My point is, I myself, personally, enjoy having the magic in my hands and no where else. I like the fact that I don't need an apparatus... that if I'm even without my cards, I can grab the family deck and perform with them. In the more knowing company of spectators, it is impressive when you used the same cards they played slap jack with the night prior to your act.
For those who have seen examples of gimmicks, who are wanting to check someone's "sleeves" I like knowing that there is absolutely nothing to discover (if you play your cards right...). I can show up in my boxers, use the deck they just bought from a cvs pharmacy and I'm no less effective than other conditions.
It is true that abstaining from gimmicks limits you as a magician. However, it limits you in the same way it would if you decided you didn't want to use sponge balls, or silks, or rope tricks, or even just coin tricks. I really see it as a preference, and one that shouldn't be judged as harshly (and I mean from both ends) as it is. Gimmicks sometimes are an easier means to an end. Some effects are practically done for you with gimmicks, while sleight of hand would be much more difficult. The trade off is in the confidence knowing you don't need anything else to perform that certain effect...
By the way, I'm a novice bass player as well. And that finger style vs pick was a very good comparison, I think it fits perfectly. But I would also like to mention that while its difficult to get a pick sound with your fingers, that most agree (at least as far as the bass guitar is concerned) that finger style is more dynamic and versatile. I am of this opinion, and that translates to my belief in "pure" magic as well.
To each his own. I am more impressed with pure sleight of hand, that is a personal taste. But I still respect those who are gaffed to the hilt and do it well.