I've imagined a company (cable phone or some other long term service) that signs everyone up at their full rate, and for every month you stay with them, they add 1% discount till after 50 months you are at 50% of full rate and stay that way. No coupons, no special just for you! offers, just an honest straightforward "we need to collect money to keep things running, but we value our loyal customers most".
Fantasy I know.