There are people in the pen-collecting world who specialise in fitting nibs to hands--that is, finding (and often grinding) the shape of nib that will work best for the way a particular person writes. Left-handers are particularly interesting in how they use pens--left-handed writers use and angle their pens and paper in an immense variety of ways. There's an interesting article on the subject
here.
I collect fountain pens, mainly vintage Pelikans. It tends to be an expensive hobby, but it's also one where a knowledgeable person can make money too. I once bought an old pen on a local auction site for about a hundred dollars and sold it for more than a thousand dollars than a week later. That was luck, not skill, I only knew enough to know that if that pen was common I'd have seen pictures of it before, so I bought it, and I knew enough to know where the experts were to ask about it once I had it in my hot little hand. But knowledgeable people, especially if they're technically-minded enough to have an interest in repairing old pens, can easily make it a self-supporting hobby, where enough profit is made to pay for new additions to the ever-growing personal collection.
Fountain pens are great pens, there's nothing obsolete about the technology involved. For many people, fountain pens are easier to use and less likely to cause writer's cramp than ballpoints. They're not (with the exception of the Pilot Varsity) designed to be disposable, so they're better for the planet than the incredible quantity of Bic ballpoints the average person would go through in a lifetime. If you live in a country where bottled ink is fairly cheap (I don't, alas), even an expensive fountain pen can be very economical over the long term. The only major irritant for most people wishing to use fountain pens is in fact caused by the paper manufacturers: with the rapid rise of ballpoint pens in the last few decades, they've been able to get away with supplying cheaper and cheaper paper, paper with less rag content, and the result is that now you can't be sure when you buy a ream of copy paper or an expensive little stationery set whether fountain pen ink is going to feather and bleed through it. But that isn't the fault of the fountain pen or the ink (though you can often adjust those to compensate), it's all about the paper.
