Yes they do. It's genetic and not something we can change. Goldfish are a medium to large species of carp; growing big is what they do. Despite the mistreatment they get in their early lives, they can still grow over a foot long.
If you really want to save feeders, wait until you can afford a large pond. Buy them and grow them out to about five inches in a 55 gallon tank. Then add them to your pond in the beginning of summer. You will be rewarded with a large fish that will probably live 15-20 years.