It depends on what you want it for
If it is just salary then maybe not, for instance, some MBA programs may suggest their graduates make $100,000 per year, but you work in an oil field barely finishing high school and make $300,000 a year.
If you go for the MBA right now, you may miss your chance to work in the oil industry for another few years (or weeks), but at the same time, the MBA lasts forever (although, real world experience is also relevant) and it may give you a leg up when you are 50 years old in the unemployment line (or maybe not, because you are overqualified)
everything in life is a cost/benefit analysis
Passing the GRE lasts for five years, so keep that in mind