I'd say not yet or to be more precise not this week. For one it's almost over and second STEPS is working to get added, currently leading. I see no reason to waste funds battling that coin but to be completely open, I support STEPS there at moment.
On C-Cex the votes are accumulating all the time, they are not getting zeroed every week (like it is done on Cryptopia). So you can pay or vote whenever you like - your votes will not be lost
They are not zeroed as I understand it, but I think you are you are partly right. However, they get stored on the right of the page. I think you get admitted when you hit 5,000,000 in total, which is why they show the running totals. So that is a lot of DOT.
I am not 100%, but the wording indicates that, as does the relatively new practice of showing accumulated votes over each voting period.