The problem is, no one is going to buy your prints and pay you the kind of money that you'd need to finance a workshop selling one or two prints unless you're already well known as an artist. In that case, you don't need to attend a workshop, you'd be qualified to teach it. Workshops are playtime for rich amatuers and a way for professionals to fleece the rich. Professional fine art photographers (that is to say, those who sell prints regularly) don't go to workshops. They're either self taught, or they went to art school or a university art program and got a fine arts degree.
How do I know? I'm a full time professional artist. I earn 100% of my living selling my prints, licensing my photos, and occasionally doing commercial work. I learned the basic technical stuff while earning my art degree at Indiana University and taught myself by practice everything else. Workshops are overpriced and basically involve paying to spend time in the presence of someone famous so you can brag to our friends about it.