@Tara Hall Wow, I can't believe I didn't see this thread when you started it. Mr. Money Mustache is my effin hero. Is it weird to love someone you've never met? I dunno, maybe its creepy, but I love that guy, ha! He saved me from a life a perilous spending and waste. My savings rate was worthy of face punches before I found his blog. And it's because of him that I found BiggerPockets.
Now, to answer you question, being a mustachian makes real estate investing painful at times. I have to separate my mustachian side from my real estate side. Sure I can cycle everyday regardless of the weather (Belgium has rain, snow, ice, hail, sleet so far this winter), but when I have to pay $5000 to fix up a house to get it rent ready, its almost depressing. You just have to think about the big picture when it comes to real estate.
Six months of picking foods at the grocery store that aren't name brand to save money can be blown away in one repair on a house.
I just tell myself, if I didn't save as much as I do, it would bite even worse. So, I think you may have to create a real estate department for your mind to be at ease with the cost of being in real estate.