The manufacturers have to make up the money somewhere. With a complex product at commodity rates, with customers mostly having no idea what the differences are between them (and for good reason, it's all just a set of nasty price/perf/quality tradeoffs that I wouldn't want to look at), you compete on very basic features and the price that they dominate.
Further, I don't see that consumers have much choice if they don't want to reinstall a fresh OS -- every major brand of PC I know of includes similar bloat. Also remember laptops don't come with a nice fresh Windows CD you can install from -- they come with a branded recovery disc (or partition) which "recovers" it to factory condition.
True, but we shouldn't pretend that this isn't a product of very recent history. When cable television channels started running ads, and when movie theaters began running commercials before the feature, it was really shocking to people. Most were enraged at the time.
The Overton Window has changed us.