I've looked at some of those auctions from Hong Kong, and at least the pics they have look like real Swarovski. Some of those vendors do such high volume they can do the cheap shipping, but others are outrageous. Other times it's the other way around-the beads are super cheap, but the shipping is $20.
If you have a bead store close by (or even a Michael's), you can compare Swarovski and Czech crystals for yourself, and you will immediately be able to tell the difference. There's just nothing that sparkles like them. Granted there are a couple of new brands out there that I haven't seen in person, but they should be labeled as to what they are in the stores so you can make a comparison.
Having said that, there is also nothing wrong with using other types of crystals (or faceted glass, depending on what you want to call them). I have lots of Czech crystals, and I use them all the time, especially if I'm doing a project that calls for a ton of crystals and I want to keep costs down.
As to the Bosses' Bead Bag, I have bought several of them over the years, and they can be a lot of fun. You get a bit of everything from plastic to glass to metals, and I love to sit and sort through it. I like getting things I might not consider buying otherwise-makes me stretch my imagination.