Not sure about the group bubble crap but the individual crap machines are $3 minimum so newbies can learn the game without having to spend a lot of money. The individual bubble crap machine everyone has their own bubble crap dice so can play at their own speed.
If you play the group crap machine everyone can play together like on the regular crap table. Many casinos now have either the group bubble crap machine or the individual bubble crap machines. My recommendation is to try one of those bubble craps machines.
