heck no! go for it. it's tons of fun! we left about 10 marbles in odd places that day. we also have ones that are large printed with the IAMC logo we leave as well. :-) who knows, could be found by a future marble collector! but I have to say, the look on kids faces when they find them and you can watch is priceless. we gave out a lot of jabos last vegas show too, handed them to little kids(with parents ok of course) and it was a blast. it's like you handed them gold. lots of smiles that day!