I think and I could be wrong he is asking do people who breed have offspring offer them up for sale or not? Hope I am getting this correct? yes... however..
Some sell some keep, some place, or trade.. as there is not a huge amount of babies being bred and hatched right now.. most don't get offered up for sale for the general market.. "pet trade" .. no insult but not going to see a bunch of captive bred for sale.. the few and are often snatched by other serious people.. so yes they don't keep all of them, just may not be something you can get easy..