If you are gonna have around 30bbs, then its a good move. Its also smart to late reg in a big tourny with big field sizes. Theres not a huge advantage of playing from the start, you can try to build up a big stack but can also knock yourself out of the tourny. And when cooler situations come up, theres not a lot you can do about them. I think you can take away a lot of risk by late regging plus save a lot of time for a long tourny grind.