^^Nah, some of the coins you have might be worth more than $1 or $0.50. They may be worth $1.03 and $0.52 now.
My mum has uncut sheets of the old $1 bills, $2 bills, $5 bills, and I think even the $10 and $20 bills. They were either replaced or completely discontinued (ie: the $1 and $2 paper bills). Every sheet has 40 bills on it, so what started out as a cheap hobby ended up being very expensive when they recently replaced the $10 and $20 bills. 😱
They're also cost more to purchase when uncut, so 40 x $20 notes doesn't mean that sheet cost $800. 🙄