4 of my 5 dc's have modelled on and off all of their lives so far. DS (now 13) and DS2 (now 7) have been the most "successful". DS1 has a substantial sum to see him through uni, even deposit on first house if he chooses when he is 25.
We have met some lovely people and been to some great places, 9 times out of ten the kids are treated very very well, on the odd occasion they are not, you tell your agency, they deal with it, or you choose to not work with that cpompany again.
Both my ds's love seeing themselves on things, they have made lots of friends who they tend to see time after time at shoots, we are with a reputable agency and when dc's tell me they don't want to do it any more, we'll stop.
And yes sometimes I put their recent pics on facebook or similar, then the rellies that don't live near us/have a boden/white company nearby, can see.
dc5 has never modelled, she is cute but simply does not have the personality for it, my choice.
Yes there are some pushy mums, (and dads) but truly, they are few and far between.