Waiting for the last possible minute to play is also done in unlimited comps ... and in this case, there is a distinct advantage, if you have managed to post a score lower than the leader, whether it be stroke play or CTTH. It gives virtually no time to the competitors to notice that they've been bettered, and complete another round in hopes of regaining their spot. One of the pitfalls of unlimited play competition. I won a weekly nine unlimited back in 2009 in this manner, and though I was happy about the win, it leaves a bad taste in your mouth, and I don't intentionally do it anymore.
But as far as single play comps go, it gives you no advantage other than a psychological one. I've seen plenty competitions where the leading score was shot within the first day or couple of days and it remained top of the leaderboard until the end.
But I am in favor of cutting the time on Ready-Go's somewhat .... say 6 or 8 hours max.That would allow people to enter a Ready-Go, and even if it closes when they are at work or asleep, they still have time to complete their round in the given time frame. Given, they would have to be careful as to how many players have entered, and how fast these comps fill, so that it doesn't close and end before they are able to get back to their PC. Understandable why there is only 3 hours for a CTTH RG... they only take about 7 or 8 minutes to shoot.
Seems to me a happy medium ...