Universal pronunciation

What really gets me riled up in the land where the supposed 'universal' language came about, is that the people have way too many ways of pronouncing a damn word in their own little 'universal' dimension. So why does one call it the universal language when there's no one universal way of pronouncing the same words that make up the won

So what i'd like to know:

1) Tomato: To-mat-o, To-maa-to, To-may-to
2) Gross: G-ross, G-roce

Only to name a couple!