A few points I would make here.
First, it shouldn't matter whether a win brings you bragging rights or a handful of C-Notes, it's still a win. What the winner gets at the end of the day is often determined on how much they shell out at the start of it, combined with how many people are entered. How your career in tournament goes will only be limited by your abilities and possibly the size of your wallet.
Secondly, only the truly insane are going to blow $70k on a rig to start fishing tournaments. My advice is to find a decent used rig that is big enough to handle the size water your new tournament schedule requires. This requirement isn't in the rules, but is based on what you need to safely navigate the body of water and reach the areas you want to fish in a manageable amount of time. Recently a member here posted up a used Ranger that I think looked like a very good deal, and if I was looking at getting back into tournaments would have had me interested in it. Here's a link to it:
http://www.bassresource.com/bass-fishing-forums/topic/145943-2003-ranger-185vs-for-sale/#entry1628990
Finally, I'll touch on this whole front seat -vs- back seat debate. If you want to determine how your day on the water is going to go, then you need to own the boat. If you want to sit in the back end and take your chances of drawing someone that knows what they are doing and more importantly will give you the chance to compete, then by all means save your money and roll the dice. My personal opinion is that it is hard enough trying to catch a stringer big enough to compete with in the front of the boat, and I can't see any reason to add to that challenge, what I would call the "Luck of the Draw!" to it.
Just my opinion!