It's a stupid thing that

• exists only in English as far as I know, every other language puts it after the number,
• is not used consistently (since you still write 25¢ and not ¢25),
• doesn't follow the way you read it (it's "five dollars" not "dollar five").

It's one of those places where yes, the spelling rules say otherwise, but the rule is fucking stupid so anarchy it is.

I'm more irked by "less", the noun there is dollars so it should be "fewer"...

Tell that to French Canadians. This is the standard in Québec.