Most laptops aren't native anything - they have video cards that can be set to whatever you want on the output side and anyone making presentations should be aware of how to set their laptop up correctly for a presentation.
IE: My laptop has an attached LCD monitor that has a resolution of 1680x1050 (WSXGA+), but that has no impact on the native output from the back of my PC which can be set anywhere from 320x240 to 2048x1536 or something like that. If I set the output from my laptop, on the VGA port, to 800x600, then it will be displayed perfectly on that projector. I don't force the projector to rescale the image from 1600x1200 down to 800x600 or anything crazy like that.
The main reason I know of for SVGA projectors is based almost entirely around price. Not sure I would ever buy one that low, but if I'm looking for a cheap, ready to go projector that could possibly be damaged, lost, or stolen, I might consider the chepeast projector I could find that gets the job done.
Then know how to use it correctly.