As long as the vouchers don't come as a surprise, you'll be ok.
At this point there is nothing indicating that people will be getting a voucher as result of there not being any chips available at a certain time. I understand that people will likely end up not depositing coins if the site state that the chip pool is empty, but if one thing is very clear, it is that people will feel uncomfortable when their deposit is 'stuck' and there is no way to get it out. If I read through the FAQ, there can be found a (what are vouchers) headline, but when you read through everything, there is nothing that explains that a voucher is also a tool that is handed to people at the time there aren't any chips available, and that they will be refilled asap. It will give people a piece of mind in the end if this information is included in the FAQ, and will prevent them from popping up in this thread asking why they are getting a voucher.
Yeah. If the alert system ensures that they are informed that they
will get vouchers instead of chips (at the moment I guess at best the system can only inform of the
possibility), and provide a detailed link of how to use the vouchers, I'm very sure people won't mind. If they're already at the level where they're using mixers, and CM at that, they're probably not going to be the "come to bct and whine" type.
Why not have it set up where there is a fee scale based on how long you keep your coins on the chipmixer system? ranging from investment return for keeping your coins on for a long period, to paying higher fee when you remove your coins immediately. something like this.
+3 months= +1-2%
2 months= +.50-1%
1 month= +.10-.50%
10 days= 0%
5 days = -0.10- -0.50%
1 day= -0.50%- -1%
immediate withdrawal to 1 day = -1- -2%
Actually, I like this a lot more. This could be one way of preserving the current fee structure for those who use chips quickly. I'd keep the lowest to 0 though!