Presuming your daemons rotate their logs, what's the benefit of this over mounting a plain-old tmpfs over your logs folder? Either way, the shipper reads virtual files that are actually stored in memory, and which eventually get purged. It's just the thresholds that are different.
You'd have to be rolling your logs fairly often to avoid filling up tmpfs with log lines that have already been shipped. The advantage of this approach is that log lines that are shipped are no longer on the box at all.
