Besides, Apple are being much more liberal re iOS approval of late - the old times are long gone except the odd mistake here and there.
EDIT: I wonder if this will act as a proving ground for apple re dual App Store + adhoc distribution ala android market?
EDIT2: I'm just going to come out and say it... At times I worry about installing random dmgs I find on the web. If Apple can approve the apps and ensure they are genuine and won't harm my system then I wouldn't be surprised if I'd end up switching to the Mac App Store for all my apps... With exceptions for companies I know well. This is a potentially an awesome social-engineering solution to malware/viruses in the long-run.
EDIT3: Final edit as my startup won't launch itself! :P To anyone suggesting Apple will take away adhoc OSX installations and replace purely with Mac store: 1/ On what timescale? This would be very long-term - we'd adapt 2/ Is it really a problem? See Edit2 above for at least one benefit.