I wish I could unlock other trains without $$ – Thomas & Friends Minis Review

My son loves Thomas the train. I downloaded this and started playing with him and he loved collecting the golden gears. I was so excited for him to be able to get Percy and James but we eventually realized that additional content has to be purchased after a certain point. I understand you guys need to make money but I wish at least some of the items in the other boxes was collectible with golden gears. Super disappointed to watch those golden gears disappear after collecting the free content.
Review by Fix please.. on Thomas & Friends Minis.