In fact, I have started handing out a minion's worth of XP anytime a player has a successful check after having their character do something interesting. It really encourages the roll playing and action hero kind of antics that make 4E really awesome.
My experience with the "Do something interesting and get XP" plan has been that is sounds really good in theory, falls apart in practice. Starts out really good, but by the time your players are on their 6th or 7th interesting-thing description to get XP you start to see eye-rolling and a general feeling of 'puppies doing tricks for treats' settles in.
Players are generally not in a submissive position to you; they know just as much as you do what you're doing, and they can resent it if they feel you're making a bad subjective call that impacts their game. Also over the long term, the whole 'do something interesting and get rewarded for it!' thing just gets a bit stale, from players trying to do the something that was "interesting" the first time over and over, having to explain that "interesting" really means "interesting the first couple of times and then not anymore", to player just simply running out of interesting ideas. Everybody has a limited amount of creativity and sooner or later they run out, and then you get the situation of "Ok, I COULD get more XP if I can just think of ONE interesting thing to say but i just can't think of anything" freeze-up problem.
Idono, I mean obviously if it works for you and your group that's awesome, I'm just saying it's really not as simple as it sounds to just say it, and once you actually put it into real practice there are many little niggling things that crop up that make it harder than it sounds. I used to be a BIG proponent of interesting descriptions for XP/+2 bonus/surprise in combat/extra action points/stunts etc etc, but I just had to drop it when I started seeing the consequences of it. This is just my experience, yours may differ.
Edit -> It occurs to me that I may projecting my experiences onto you and that what you're talking about may not be what I'm imagining at all, so if that's the case, my apologies - there are a lot of ambiguous places when speaking about D&D and games and stuff

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