customer groups and loyalty discounts

[eternalc]

Hi all,

 

I'd like to offer a loyalty system based on an accumulative percentage discount. EG once the customer's order total reaches $500 they get a 5% discount.

 

One way of doing this might be to use customer groups, where a customer's order total automatically advances them to a new customer group with a set discount. I'd be setting up 4-5 groups with different discounts.

 

There would need to be an automated email which would notify the customer when they reached a new discount tier.

 

Is this possible without a custom developed module? Or if not is anyone interested in developing such a module?

 

Cheers!