Consistency is the key. It's not a few pesos once in a while. It more pesos every time. Sometimes a lot of pesos. When you get the best rate consistently, those pesos add up rapidly. And what is this nonsense about sticking with a proven winner? Do you work for Western Union or something? I have had many, many problems with Western Union, but I've never had a problem with MoneyGram.
I got a 5.8% increase in my social security last year, and Western Union wants 5% of it. No thanks. Not if there's a much better alternative.
I'm glad for you that you're so wealthy that you can throw away money. That's your choice. But I don't think that you should suggest that it's the right choice for everyone. Kindly pass the fine red wine that I bought with those extra pesos.