If your employer foolishly offers to fund a night school MBA, you might consider it. But if you must spend $30,000 to $100,000, skip it.
The top schools get $150,000. There are half a dozen that may pay off: Harvard, Chicago, Wharton, Stanford, and maybe a few otherwise. These are the diamonds. The rest of the schools are rough.
You are buying lifetime contacts in the biggies. You are buying self-esteem in the others.
If you spent the same amount of time mastering direct-response marketing for under $500 in books (used, Amazon), you would be far better off.
If you can get a consulting job part-time, take it.
If you think an MBA from some school will help you, find out before you write a check. It may not help.
Doubt me? Read this Wall Street Journal article.