With those numbers I'd buy 2 economy seats, plus $10 at the grocery store to buy snack and another $15 if necessary at the overpriced airport shop for beverages, before I spent 12x on business.
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And if you think the DR crticism is because of his religion, you aren't paying attention and are looking for something to fit your narrative. IDC that he's religious--no matter the name or shape of his god--but I do care that he gives a lot of bad financial advice. Invest in actively managed funds--"growth" funds in particular--and expecting ~12% returns? God or no God, that's bad advice. 8% SWR? God or no God, that's bad advice. No gifts or loans to children in any circumstances? Not only is this IMO bad advice, it seems pretty contrary to the book Dave says he believes in. Would Jesus say, "sorry, responsible 25 year old offspring, even though I have $1.5m in the bank and a 3% WR, I can't give or lend you $10k to help you pay off your medical bills. Super glad the chemo worked, but suck it up and find a way to pay for it!" Is that WJWD, or good advice? Even "don't use credit cards" is bad advice for many (most?) people as there are financial and security benefits to them as long as you don't overspend.
So yeah, it's not because he's an evangelical. It's because lots of his advice is bad and lots more of it (PAY OFF YOUR MORTGAGE ASAP!!!) lacks nuance and is bad for plenty of people.