I used to not like blog contests either...but I actually won a bunch of them, then I started my own blog. It is so much fun, and I've met so many nice people. It's just like any other sweep, if you don't like the prizes, you shouldn't enter. Sometimes it's fun to win makeup, lotions, or other stuff. It just depends on what you would like. For some people they may not be be able to afford fun extras and this is a way to get them.
Many companies do donate items for bloggers to review and giveaway. I don't make any money on my blog, but I'm having a blast with it.
The rules for blog contests aren't like normal sweepstakes, they are simple contests, and the blog author sets the rules. I have received every prize I have won (unlike some regular sweeps), and they arrive very quickly. If you're having a slow streak at winning, entering a few blog contests just might a fun way to win something.
The prizes aren't always small either...some are for printers, Keurig coffee makers, purses, iphones, etc. with much better odds.
If you really hate them, then just ignore them!