Jokes aside, Wikipedia has a ton of flaws and the abuse is definitely one of them regardless of what percentage of people do it, but there are just no other realistic substitutes that are actually large enough to matter. The largest and most respectable competitors are Everipedia (only one that doesn't reuse mediawiki software), RationalWiki, InfoGalactic, and some other rolled mediawiki crap. And none of those alternatives are even Alexa top 1,000 let alone Alexa top 100 traffic.