I'm good for your house
I'm bad for your phoneIn the right form I can be worth a lot
In the wrong hands I can damage a lotSome people say they make me when scared
Other people tend to hit me before they leave
So what am I?
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BRICKS?
I'm good for your house
I'm bad for your phone
Bricks are vital for building a house. A phone which is 'a brick' is heavy and unwieldy.
Also, as pointed out in comments by @postmortes, if a phone is 'bricked' it is broken and unusable.
In the right form I can be worth a lot
In the wrong hands I can damage a lot
A gold brick is worth a large amount of money (and in the US, 'brick' is a slang term for $100,000). Meanwhile, a yob in the street could put a brick through your window...
Some people say they make me when scared
Other people tend to hit me before they leave
Some people might 'brick it' (or 'lay a brick') when scared (meaning their bowels might give way a little). 'Hit the bricks' is a phrase meaning 'to travel about'.
As for the title:
Bricks are definitely hard!
Final Answer
GAS
I'm good for your house
Houses use gas to run appliances
I'm bad for your phone
You shouldn't use your cellphone while pumping gas for your vehicle, could cause a fire
In the right form I can be worth a lot
Gas can be a pricey commodity
In the wrong hands I can damage a lot
Pouring gas on something will cause greater fire damage (arson)
Some people say they make me when scared
Passing gas
Other people tend to hit me before they leave
Hit the gas - telling someone to press the gas pedal in a vehicle
Title
This riddle is hard because it contains a lot of gas within, like an air-filled ball.
Previous
LIGHTS
Although, It doesn't apply completely throughout the riddle. This is my best guess.
I'm good for your house
Household Water
I'm bad for your phone
Water spoils the phone
In the right form I can be worth a lot
Drinking Water
In the wrong hands I can damage a lot ???
Some people say they make me when scared
Sweat
Other people tend to hit me before they leave
Tear
I am a
Road
I'm good for your house.
Accessibility is crucial for a house.
I'm bad for your phone.
Phone falling on the road
In the right form, I can be worth a lot.
Well constructed roads
In the wrong hands, I can damage a lot.
A poorly constructed road
Some people say they make me when scared. (I am not sure about this one)
Roads are made when you are scared of a) accidents b) losing power if you are a politician
Other people tend to hit me before they leave
Hit the road
As the title suggests,
Roads are hard
Is it:
a dog ?
I'm good for your house:
A dog can provide safety
I'm bad for your phone:
A dog may break your phonew
In the right form I can be worth a lot:
A dog can keep you safe and be a companion
In the wrong hands I can damage a lot:
Some dogs can be quite dangerous