Hard to pin-point, but there are some things that naturally "flow" together, and others that are way too forced and contrived. A b/s kickflip to fakie 5-0 to 1/2 cab kickflip out flows. A b/s smith to laser out does NOT. Also, there comes a point when tricks reach a natural "end point," and going beyond that just enters into absurdity (a good example being AA's 10 trick ledge combos). This is even true for simple stuff like railslides and slappies. You did a 100 yard f/s slap? Cool wax, bro. Just because you can, doesn't mean you should. But, it's all subjective and as long as you're having fun....get as absurd, waxed, and contrived as you want.