SNsMoto
Don't be that guy.
Simply because you can RENT some incredibly impressive lenses. Going to MotoGP? Rent a good telephoto or telephoto-zoom lens, sit on the hill opposite the corkscrew, and have fun.
Also, even the best point-n-shoots often have some shutter lag. With absolutely 0 shutter lag, this isn't a problem with a DSLR.
Add to that, simply put, there isn't 1 lens that's perfect for every single situation. Each lens has it's difference specs and therefor you'd need to have a variety of lenses to switch between to accomodate your surroundings. My 18-70 and 50 f1.4 have prob been close to the only 2 lenses where I find I'm able to use them for a majoirty of my shots.



