If the performance is sold out, they will sell $30 standing room (cash only). There are times when the standing room spots sell out. A small child will not be able to see over the railing/last row of seats, but an adult will have no problem with the standing room view.
I did it about a month ago and there were plenty of spots not taken. I bought my ticket at 12pm for a 2 pm show. To be honest, It is really bad. Save your money!!!! The Jackson 5 numbers are the best, but do not make up for the almost 3 hour disaster that is MOTOWN!