If you do not rec anyone from today for 29 days, then use 10 on the 30th day will that then mean that for 30 days from when you "spent your recs" you will be unable to rec as you are limited to 10 in a 30 day period?
I think a few people who spend their recs at what they think is the end of a 30 day period may be in for a surprise when they go into what they think is their next rec period.