I bred budgies for 16 years, and have 7 that I hand raised from 2 weeks old. They are the sweetest, funniest little birds ever. But I think in recent years the reason the popularity of budgies as pets is because it's very hard to find hand-raised ones. Most parakeets that you can buy in pet stores are parent raised, mill birds that are scared to death of people, and even if you work with them for months and months they are never really tame. Even most budgie breeders, if you can find one, don't hand raise them but rather let the parents do it, so they aren't tame either. Most ads I see from budgie breeders say something like "will need to be worked with" or "used to be tame but not now"...as a breeder I can attest that the problem is the money they bring in comparison to the money and time you spend hand raising them. Hand raising a clutch of parakeets is no different at all in cost or time required than hand raising a Macaw, African Gray, Senegal, conure, etc. So you can hand raise budgies and at most get $50-$100 a bird (and that's for English budgies), or you can do the exact same thing and hand raise green cheek conures and get $250-$400+ a bird...
Also I think that people just want larger birds and this is a factor as well...
As far as being good talkers, some are, some aren't. If you want a good talker you need a boy, as the girls generally do not talk. And then it's just hit and miss on how well the boy talks.
"Dance Like Nobody's Watching"