I'd rather be my dad paying just 20$ a month and getting paid 28.75 an hour with full benefits than being non union and being paid 11$. Plus I'd rather use a guy who had a 5 year apprenticeship than someone who hasn't. Not totally in favor of unions but they do have there benefits such as trained individuals.
If your marketable skills are TRULY worth $28.75 an hour plus full benefits, you don't need a union to get it.
An employer will gladly pay you that.
As an INDIVIDUAL skilled worker you ALREADY have bargaining power, and the market will pay you what you're skills are actually worth.
On the other hand, if as an individual you can only get $11 an hour for your marketable skills, then that's what they're ACTUALLY worth.