I am just going to throw a couple pennies into the ring, here is a little disclaimer, just finished several glasses of a very nice wine with my spaghetti...
Way back when, there was this sport called Whitewater marathon racing, the sport was virtually brand new here in the states...
Here we were, we had an aluminum fishing boat, enough know how to be extremely dangerous, more time than money, and no fear... (otherwise known as stupidity)... And we got that old scow running hard, I think we even broke the 65mph mark and could still steer the thing.
We were running the small block class, up to 360 cubic inches, single carburetor, naturally aspirated.
Let me tell you this. We had a snowballs chance in hell of ever beating anybody. But we finished every leg of the race, didn't break or crash out and had a bunch of fun for cheap. I think we had $500 each in the boat including safety gear (there were three of us).
The next year, better boat, bigger motor, faster speed, more stress, waaaaay more money and a disproportionate lack of fun.
The funny part was, we took it too seriously, we actually finished in a much lowerplace overall because of mechanical failures.
All this being said. All of the fun can be had in the entry level and the experience is something you will literally remember forever.
What beerjet said is spot frikken on.
Don't get hung up on the rules, the fast boats break more often, the consistent boats make every start, most of all there is a ton of fun to be had,a long as you don't take it too serious.
I need to go sleep it off...
GT