Siped tires also wear out half again faster.

Schwab will often tell you "you can't get there from here" in order to also sell you a new set of wheels to boot.

When my wife enquired about snow tires for her BMW, they told her that the ONLY wheels they had that would fit a BMW were the most spendy ones they carried, and the only tires that fit those wheels were the most expensive ones they had.

Not as bad a Firestone pulling "We can't legally let you drive out of here like that ma'am."
(My response over the cell phone: "Tell them to call the police then!")

So I did some homework, as any informed consumer should do, and found out that for $2000 less, I could get some alloy wheels that fit ANY car and for $1000 less I could get snow tires that would fit those wheels...

Right there at the same Schwab that told my wife that they didn't exist.