First off, I must say that Education is very good and i don't dispute the fact that it's very vital and necessary for human development, it can put you in a position to be successful no doubt but being a graduate is not a 100% guarantee for one to be very wealthy, one can be very sound academically but lack some basic skills of acquiring wealth. Also one can still have some good knowledge of certain skills but if there's no zeal or self confidence in earning a living through it then your education on those skills can be said to be a waste since you ain't making effort to earn from it.
Also I've heard several people complain about having good grades, being 1st class graduates but find it difficult to secure good paying jobs, imagine someone struggling to achieve good grades in the university but find it difficult to earn a living and at the end settle for minor jobs while there are many dropouts with good skillsets as well as being creative and think outside the box, and are bosses of big organisations and companies.
Well it's not basically about being educated or graduating with the best grades that makes you wealthy, it's about determination, being consistent and also persistent cause success and wealth are not achieved in one day or immediately after graduating. In as much as you have good grades, you must still improve your skills, not only job skills, marketing or management skills but your critical thinking and problem solving skills.
There is a lot of competition these days, more than ever before and universities don't care all that much if their graduates are able to secure jobs throughout their career as long as the university has trained them to a reasonable standard. In the era of globalization, if a candidate in India can do the same job on $25k that it might cost $50k to hire someone in America - that is a big cost differential but still a very sizable salary in the first country. These overseas candidates may also be willing to work much harder to keep their job secure, although there is definitely a lot more chaff that needs to be filtered out. Simply, if many more people are paying to be educated to a certain standard, may the value for each of them is lowered.