If his charisma or the psychology behind his plan or something else is succesful in getting people out of bad debt then why would that be anything but a good thing?
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While there are definitely things I find wrong with what I hear from Dave Ramsey, there are definitely good things about his preaching, and above all - it is a plan to work with.
I often tell people I meet, when you have a goal you might reach it or you might not, but if you don't even have a defined goal, much less so any plan of action, what are your chances of getting anywhere good?
Any plan with consistency (and coaching definitely helps) is better than no plan and direction. This can be seen in many aspects of life. Are we lacking weight loss plans that might not have any scientific basis (fit for life, for example) but work for people just because they create a certain discipline?
What might make tremendous sense and work for people who understand certain things AND have discipline and drive, might not work for someone who might be lacking in any of those components. I meet with many people, some are my clients (in various areas that I serve) and some aren't, and I can probably have a story to tell you about every type of personality that might exist when it comes to finances.
A huge problem exists with people who are bright enough to understand concepts, but only have cursory knowledge and no experience, and definitely aren't willing to dedicate the time and effort to do the work required for what they understand to be best for them, yet can't appreciate fairly paying someone to do said work (whether in commissions or fees) or to choose an alternative that might not require that much time and effort and might sound less lucrative (potentially).
I have a fresh story from this week of a person who met me to review his options after being laid off. This person, despite being less than a decade away from being eligible for social security retirement benefits, has a grand total of $0 in any retirement savings. Some other savings that he's not really sure about in a local bank account (taxable - for crying out loud, I told him to take that money and put it immediately in ROTH IRAs for himself and his wife, even if he left it at the same bank with the same minuscule interest rate, at least they wouldn't be taxed on it, and given his age he could withdraw anytime penalty-free). There are additional sad details to his story, but one thing I did realize was that this person never got proper guidance, he just survived through life, whether when he was in business for himself or an employee, and never took the time to review and plan.