In no particular order:
(1) It sounds like you're nagging/pushing. STOP. I pushed a little hard when I discovered MMM and showed it to my bf, now I'm pretty sure he'll never read it. And we had been together longer. I sometimes share with him the most ridiculous "antimustachian" posts from this forum so we can laugh about them, and leave it at that.
(2) You sound like you're unhappy that he isn't doing what you're telling him; maybe that's an incorrect reading, but that's what's coming through the page to me. If that's the case, you need to internalize the concept that he is an independent adult that makes decisions based on his own experiences, preconceived beliefs, and the facts presented to him. Sometimes, he will draw different conclusions from you, even given the same information (and this pertains to more than money). Sometimes it's ok to let it go or find a compromise; if it's not imminently endangering your well-being or showing unfathomable stupidity.
(2b) Unfathomable stupidity is skipping your CC and SL payments to go gamble your whole paycheck away in Vegas, and then some. Buying a car at 29% interest for 7 years. Your dude sounds like he's making regular payments and his card isn't perpetually maxed out; sounds like his worst sin is it sometimes has a balance (yes, I think that's worse than buying a new car or even partially financing it). It sounds like he has *some* notion of financial responsibility, and I think you could work with that. Slowly and gently.
(3) Is your primary goal/reason for this relationship to have someone to pool finances and sock money away with? Obviously for some it's a top priority (see above). But IMO, it's more important to have someone who can enjoy the simple things with you--a good hike, a homemade meal, a conversation about a book, your laugh, stargazing, a roadtrip. Talk sometime about what his idea of a good life is, who he wants to be. CEO with a private jet and a collection of sportscars? it's possible it won't last. Comfortable life, security, free time, putting his kids through college? He'll probably come around with time.
(3b) If there is hope, find things you both find ridiculously extravagant, for common ground. Find ideals that you share and bring your communal choices back to that instead of frugality (e.g. environmentalism). You can't use a common future to convince him because you don't have one yet; you need to find common ground in the now.
There are people on this forum who buy new cars. Who travel intercontinentally. Who hold on to big-4 cellphone providers. Who have cable. Who have vacation houses. Who have expensive hobbies (cars, planes, horses, sailboats, "foodies," marathons, triathlons, etc). They probably aren't the ones with $10k/year budgets, and no one is doing most of the above all at once. It's not all or nothing; you can write your own philosophy and find room for compromise and for deciding that he is good enough and worth more than $X in the bank. But only you can make that choice of how far you are willing to go.