A few things: You start making bank when you check out of the hotel, not when you place your reservation. Also, you have to book your room through the Club Epoque website, not through the individual hotel sites.
There are other perks of club membership. You get free WiFi in all hotels, which alone is worth the free membership. It also enables you to check in early and check out late, and to transfer your bank to someone else, in case you're feeling charitable.
Epoque counts more than 300 boutique properties in its roster. Member hotels include the Kimberly Hotel in Manhattan and the Hollywood Roosevelt in Los Angeles (which we recently named to our list of the sexiest hotels alive).