Well TT (and Catz), where shall I start...
FRONT INTO KERB:
1. When you come in to park , you're braking to a stop - if front in you're going down (the normal) adverse road camber - hope there's no slippery leaves, mud or gravel risking the front wheel sliding out from under you as you pull the front brake to stop.
2. When you are leaving, if you're front in, you have to awkwardly 'walk' your bike backwards UP the camber potentially INTO traffic whilst trying to look over your shoulder for traffic coming in your lane.
3. Bike stands 'roll off' by the bike rolling forwards, so it's easier for the bike to accidentally roll forward off it's stand if parked front in because of the downward road camber (or some snotty little urchin was playing with it).
4. Front in, you look like a newbie to$$er.
REAR INTO KERB:
5. Rear in and the bike won't roll off the stand accidentally.
6. Rear in, when you are leaving you simply accelerate - up out of the camber in one smooth movement, whilst you're looking forward, easily seeing any traffic coming in the lane you're entering.
7. Rear in, when you are leaving, you can create a very cool 'drag-off' profile, accelerating out with one foot trailing stylishly behind, impressing the girls no end

8. Rear in. the engine climbs the camber... no effort, front in you have to 'climb' up the camber, footing, backwards!
Seriously, a lot of this balances small risk against No risk. So why risk anything if you don't need to? I reckon newbies should be 'coached' to learn good habits, not bad ones, from the start. Sure, you'll be able to concoct various scenarios that are different, but I'm talking average normal situations.