Cost of handling, packaging and shipping has nothing to do with value.
Cost is generally determined by weight, measurements and distance traveled.
Are you looking at Canadian sellers or American sellers?
Shipping parcels within Canada is expensive. For example, a typical 1" thick hard cover used book, worth $3 to $5, will cost from $10 to $15 to ship within Canada - using the cheapest rate possible.
If coming from the USA. much depends on the method of transportation used. Many US sellers are now using the Global Shipping Program (GSP) which, quite frankly, is not suitable for most Canadian buyers in most instances, more so for low value transactions.
If you feel the shipping charge in a listing is too high you can always contact the seller and ask if it could be shipped cheaper. To do so, use the "Ask a question" link available under the description section of all eBay listings.
Good Luck.