We can have this discussion forever...
But I don't care what anyone says, nobody except an idiot got into the music business to not be financially successful, as long as they could express their art. Even the artists who absolutely love what they do are still doing it as their livelihood (unless they have other avenues of getting money and really, really just rap because they enjoy it).
If the older artists had the opportunity and/or understanding of the business that rappers later had, they would've tried it just the same. One of the biggest gripes that used to come from a lot of the old school guys was that they used to get jerked, didn't get good deals, and were not business savvy enough to do other things. A lot of them did do this strictly out of wanting to make music and get paid, but they also suffered the most because they got into the industry and weren't getting paid rightfully.
And then years later, rappers got a little smarter and began to know their worth, and got better deals than a lot of the old school dudes did. This is when people like Too Short, EPMD, Eazy, etc. were smart to the business and made better moves. THEN, certain rappers like Jay, Master P, RZA, 50, etc. got REALLY smart to the biz, and they learned how to flip shyt even further, and so on. That mentality (at least as it relates to the people smart enough to actually put it into action) didn't ruin hip-hop, it made it better for the people doing it to make money instead of just making money for everybody except themselves. They made this shyt something bigger than rapping for petty cash while a bunch of people who don't give a shyt about the music count all the real money.
Anytime money comes into something, it's going to affect it to a degree, but the truth is this would've happened years ago if the older artists knew how to do it. You can't really blame the rapper/hustlers who REALLY made moves because a bunch of dumb muhfukkas wanna be like them but make terrible music, and usually don't last long anyway.
And it's hard to question the integrity of someone without knowing where their head's at- so yeah, there's some rappers out there who are in this as nothing but a way to make money. That's not to say that was their original only reason to begin rapping, or even their only reason now. But if you're gonna get in a business that would bleed you dry if you let it, it would probably be smart to learn how to avoid that. And if it takes being more of a hustler and businessman than just an artist, so be it.